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Differential input/output gain programmable amplifier circui

2015-01-05 23:08  
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Differential input/output gain programmable amplifier circuit
Differential input/output gain programmable amplifier circuit
As shown in the chart, the circuitis thedifferential input/output gain programmable amplifier circuit. This circuit is composedof two pieces of PGA202 integrated circuits. PGA202 is mosfet input instrument integrated amp, and its gain has four different values: 1, 10, 100 and 1000. In circuit A0 (pin 1) and A1 (pins 2)are gain control terminals. when A0 and A1 are at different levels ( 1 or 0 ),their gainvalues aredifferent. Because here is two amplifier circuits using parallel form, thus circuits' total gain is twice of the monolithic gain , namely Vo = 2Av1Vi. Av1 ismonolithic amplifier circuit's gain, so the circuit's total gain is Av2 = 2Av1. CorrespondingAv2's valuesalso have four: 2, 20, 200, 2000. The relationship betweenthe total gain Av2 and gain control ports A0, A1 is listed in table.