The 4051 can work, but keep in mind it has a number of error. This application note discusses how to use the max532 to build a programmable gain amplifier pga thats suitable for ac gain control. High commonmode voltage, programmable gain difference amplifier ad628 rev. The gain can be set from less than 1 vv to over 100 vv. It is not uncommon to need an adjustable gain in an analog signal processing chain. Jul 20, 2015 the ad8557 has an adjustable gain using digital potentiometers and a programmable offset using a digital to analog converter dac. Design of an ecg signals amplifier with programmable gain and. Bandwidth is 250khz at g100, yet quiescent current is only. Both gain and offset trimming add active calibration capability to the differential amplifier through the 10bit analogtodigital converter adc. Using an equivalent wheastone bridge in order to apply a diffrentialvoltage from 10 mv to 300 mv to the pga interface, it is verified the accuracy and stability of the gains predefined in the module.
If the adjustment is manual then it is pretty straightforward you can use a potentiometer. Programmable gain amplifiers products microchip technology inc. Select and enable inputs are compatible with standard. We tested the chip in the circuit shown above with a 3. Three address inputs, used to select the i2c slave. Mcp6s28 functional block diagram product specifications.
The gain, of the programmable gain amplifier, is set by programming the selectable tap in a resistor array and the feedback tap in a continuous time analog psoc block. Pga11x zerodrift programmable gain amplifier with mux datasheet rev. The max5420 and max5421 are digitally programmable precision voltage dividers optimized for use in digitally programmable gain amplifier configurations. The 075db variable gain range is obtained by cascading a 015db variable gain stage and four 15db fixed gain stages. App note, 4051, using an analog voltage to control a digital potentiometer. Creating a programmable gain amplifier with a digital pot and. The ad526 is a complete software programmable gain amplifier spga implemented monolithically with a drifttrimmed bifet amplifier, a laser wafer trimmed resistor network, jfet analog switches and ttl compatible gain code latches. Pga900 programmable resistive sensing conditioner with. Max9939 spiprogrammable gain amplifier pga with input vos. In this paper, a programmable gain amplifier pga is designed and implemented for gpsgalileo and wcdma dual mode receiver using tsmc 0. A 75db programmable gain amplifier for dual mode wireless. Such a device has a gain that is controlled by a dc voltage or, more commonly, a digital input. Hi friends, im trying to design a simple pga programable gain amplifier, using cd4051 8channel analog multiplexer with op07 opamp.
Equations are provided to easily calculate the output values. Ratiometric and absolute voltage output 4 to 20ma current loop interface. If you circuit doesnt use an instrumentation amplifier or you need some adjustable gain after an instrumentation amplifier then you need to look at alternatives. Gain of the three op amp instrumentation amplifier by paul j. When you need the adjustment under digital control then it becomes more complicated. The first digitally programmable gain amplifier consists of a ccii, an operational transconductance amplifier ota, and current mirrors. The first stage is a balanced input, balanced output amplifier formed by a1 and a2 which amplifies the differential signal but passes the common mode signal without amplification. The gain accuracy and gain temperature coefficient of the amplifier circuit are primarily. The ds4420 is a fully differential, programmablegain amplifier for audio applications. But later, i wanted to be able to amplify this signal with the gain in 4 different levels. The gain and bandwidth of the amplifier is digitally programmable.
Us7408411b2 high linearity programmable gain amplifier. You can find detailed information about this block in the applicable device datasheet and technical reference manual trm. The pga103 is a programmable gain amplifier for general purpose applications. Highdynamicrange programmable gain amplifier with linearin. A programmablegain amplifier pga is an electronic amplifier typically an operational amplifier whose gain can be controlled by external digital or analog signals the gain can be set from less than 1 vv to over 100 vv. Ltc6912 dual programmable gain amplifiers with serial digital.
The pga103 is ideal for systems that must handle wide dynamic range signals. Ad628 high commonmode voltage, programmable gain difference. B information furnished by analog devices is believed to be accurate and reliable. A complete device list and corresponding data sheets for these products can be found at programmable gain amplifiers operational amplifiers. About variable gain amplifier controlled by microcontroller eevblog. Programmable gain instrumentation amplifier ad8251 rev. Programmable gain amplifier using the programmable gain amplifier in the s12zvla, rev.
Max5420 digitally programmable precision voltage divider for. About variable gain amplifier controlled by microcontroller page 1. Max5430 15v digitally programmable precision voltagedividers. The second stage is a differentialtosingleended, unity gain stage that adjusts the dc output level by adding an offset voltage programmable within 25% using 2 trimming bits. Two digitally programmable gain amplifiers based on current conveyors cciis are presented. Two digitally programmable gain amplifiers based on current. Programmable gain amplifiers pgas, operational amplifiers and comparators design guide high performance devices for a variety of precision and embedded systems applications design ideas in this guide use the following devices. The mcp6s21268 precision programmable gain amplifiers pgas are programmable over an spi bus and thus add gain control and input channel selection to the embedded control system. The inverting gain is adjustable using a 3bit digital input to select gains of 0, 1, 2, 5, 10, 20, 50 and 100vv in the ltc69101. The ltc6912 is a family of dual channel, low noise, digitally programmable gain amplifiers pga that are easy to use and occupy very little pc board space.
A 12bit software programmable gain amplifier can be config ured using the ad625, a cmos multiplexer and a resistor. These pgas are optimized for high speed, low offset voltage and singlesupply. An5326, using the programmable gain amplifier in the. The gain, input, reference, and output bus enable are set by the user from tables of values in the device editor. The input signal through the pga can be mixed with the digitaltoanalogconverter dac results or can be directly fed to the devicesoutput. C interface and it is optimized to drive loads as low as 50 the gain is adjustable in 3db increments across the entire range. These multiplexer circuits dissipate extremely low quiescent. A 12bit software programmable gain amplifier can be configured using the ad625, a cmos multiplexer and a resistor network.
Click max9939 spi proraablegain apliier ith input v os tri. A programmablegain amplifier pga is an electronic amplifier typically an operational amplifier whose gain can be controlled by external digital or analog signals. Programmable gain amplifiers pgas, operational amplifiers. Unlike previous instrumentation amplifier designs, the on resistance of a cmos switch does not affect the gain accuracy. Digitally controlled programmablegain instrumentation amp. A particular gain is selected by applying the appropriate gain code see table i to the control logic. This device is known as a variable gain amplifier vga, or programmable gain amplifier pga. A 420 w 100ghzgbw cmos programmablegain amplifier leveraging the crosscoupled pair regeneration 2016 ieee international solidstate circuits conference 1. Programmable gain amplifiers the mcp6s21268 and mcp6s9123 precision programmable gain amplifiers pgas are programmable over an spi bus and thus add gain control and input channel selection to the embedded control system. A 450 mbs analog frontend, integrated into a 1617 code rate epr4 read channel, contains an agc loop, which includes a programmable gain stage pga, an exponential variable gain amplifier vga. The low cutoff frequency is tuned in the first stage by a pseudoresistor and it can be adjusted from 0. Microchips family of programmable gain amplifiers and operational amplifiers are suitable for low power, precision and general purpose applications.
A cmos programmable gain amplifier with a novel dcoffset. Variable gain amplifiers to meet your varying performance requirements gains up to vv and bandwidths to 4. Variable gain amplifiers programmable gain amplifiers. Description the max9939 is a generalpurpose, differentialinput programmablegain amplifier pga that is ideal for conditioning a variety of wide dynamic range signals such as those found in motor currentsense, medical instrumentation, and sonar data acquisition applications. I wanted to create a pga using a single supply op amp and digital pot. Miller consider the amplifier illustrated in figure 1.
Examples for the external digital signals can be spi, i. A programmable gain amplifier pga circuit introduced in this paper has a dynamic gain range of 98db with 2db gain steps and is controlled by 6bit gain control bits for a 3v power supply. Lownoise programmable gain amplifier 24bit sigmadelta analogtodigital converter builtin internal temperature sensor with option to use external temperature sensor 14bit dac with programmable gain amplifier output options. The impedance selector is connected in series with the output of the first gain element. Gains of 1, 10, or 100 are digitally selected by two cmosttlcompatible inputs. In the case of voltagecontrolled vgas, it is common to make the gain in db proportional to a. These inputs are overvoltage tolerant ovt for level translation from 6. Contact your local microchip sales representative or distributor for volume and or discount pricing. Pga11x zerodrift programmable gain amplifier with mux datasheet. If you need a digitally adjustable instrumentation amplifier then there. The output of the programmable gain amplifier has a twopart.
Programmablegain amplifier, using the max532 dac nov 01, 2000 abstract. These are stress ratings only, and functional operation of the device at these. The prices are representative and do not reflect final pricing. A complete device list and corresponding data sheets for these products can be found at. Maxim integrated 2 absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device.
Programmable gain amplifier pga cypress semiconductor. I have no great expierience in adcs but from my point of view i see it as using the smallest vref source i can find that is also bigger than the bridge output 200 milli amps and having a opamp before the adc with a fixed gain and not just putting pga which is max 8 times. C while the latest pgas can also be programmed for offset voltage trimming, as well as active output filters. The max5431 includes an onchip matching resistor for op amp input biascurrent compensation. Programmable gain amplifiers in sot23 the ltc6910 family are low noise digitally programmable gain amplifiers pgas that are easy to use and occupy very little pc board space. I hooked up my circuit like below, but my signal is getting attenuated with rwb 200 ohm and rf 1k. The result is a high performance, programmable instrumentation amplifier with excellent speed and gain. Lmp8100 1features description the lmp8100 programmable gain amplifier features. The second one is composed of current conveyor analogue switches ccass. Programable gain amplifier, using cd4051 eda board. The ds4420 is a fully differential, programmable gain amplifier for audio applications.
Programmable gain amplifier features digitally programable gains. Nov 24, 2017 this paper presents a high dynamic range programmable gain amplifier pga with linearindb and digital to analog converter dac gain control using a bicmos process. I microcontroller with an adc running on 3 v and the pga powered from 5 v. Max9939 spi programmablegain amplifier with input vs trim and utput p amp. A cmos programmable gain amplifier with a novel dcoffset cancellation technique xiaojie chu, min lin, zheng gong, yin shi suzhoucas semiconductors integrated technology research center suzhou, jiangsu, 215021, p. Programmable gain amplifiers device switching channels3 db bandwidth mhz gain steps vv supply current ma typ. Xx0 are now connected, ideally i should be having the feedback resistor of 47k on opamp. G information furnished by analog devices is believed to be accurate and reliable. Programmable gain amplifier programmable gain amplifier.
I2c programmablegain amplifier for audio applications. Snosao1c july 2007 revised march 20 lmp8100 programmable gain amplifier check for samples. Aug 03, 1993 a programmable gain amplifier including first and second gain elements are connected by an impedance selector which allows programmability of the gain of both gain elements. When the input signal is too small, the multiplexer and resistors can be used to control the gain of an amplifier. One superior amplifier can be used to perform the functions of multiple amplifiers at a lower cost. A db iip3 improved lowpower cmos rf programmable gain amplifier using differential circuit transconductance linearization for various terrestrial mobile dtv applications tae wook kim, bonkee kim1, youngho cho1, boeun kim1, and kwyro lee dept. A differential switchedcapacitor amplifier with programmable.
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