Very low input current jfet amplifier

Details Very low input current jfet amplifier Very low input current jfet amplifier

H - Electricity

03

F

330/20, 356/73

H03F 3/45 (2006.01) H03F 3/30 (2006.01)

Patent

CA 1248599

ABSTRACT OF THE DISCLOSURE A monolithic IC chip having a differential ampli- fier comprising a pair of JFETs with their top and back gates electrically isolated to provide a low-leakage-cur- rent input to the top gates. The amplifier includes index pendant bias circuitry for setting the potentials of the JFET back gates to a level close to that of the top gates. This circuitry includes resistive means coupled to the source electrodes of the input JFETs, and operable to establish a low-noise bias point for the back gates. The bias circuitry includes a reference current source com- prising a pair of JFETs identical to the input JFETs and arranged to provide a gate-to-source voltage to match that of the input JFETs.

528065

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