Solutions Search - LT1079 - Micropower, Dual and Quad, Single Supply, Precision Op Amps

Programmable Gain Amplifier (Single Supply)

Jan 1st 1987
The CMOS switch selects which feedback node is used, thus setting the loop gain to different levels as desired. The advantage of this circuit is that the capacitance and leakage effects are isolated from the feedback resistors so accuracy is maintained. The deselected opamp sections saturate, but remain well behaved with the ...

Picoampere Input Current, Triple Op Amp Instrumentation Amplifier with Bias Current Cancellation

Jan 1st 1987
The upper three opamps form a standard instrumentation amplifier. The additional opamp at the bottom is used to provide a bias current into all the inputs so that the source signal loading is minimized. The circuit takes advantage of the close matching of sections within the IC so that when the lower section is bias-canceled, ...

Micropower Multiplier/Divide

Jan 1st 1987
The X, Y, and Z input amplifiers servo to control the emitter current of transistors according to the applied signals. The transistors Vbe varies logarithmically to the current and so the emitter of Q2 includes the sum of the X and Y logs. The Z signal log is provided at the Q4 base so the resultant Vbe at Q4 is Vbe1+Vbe2-Vbe3. ...