Double transistor low noise of the preamplifier measured by high  

Preamplifier Circuits
Added on
Mar 28, 2007
Bong ordinary differential amplifier circuit and the difference circuit is that it has made a voltage-current conversion circuit rPl constituted with R. And Rl o of the OP ampl
Double transistor low noise of the preamplifier measured by high - schematic

ifier includes a voltage dividing, and then convert it into current feedback. Voltage gain of the circuit can be A! Type Health + VRi) (1, a Rioj R.) --- Rs calculated. If quad + v crown. About cricket oQ, according ugly s 33 2 ~ ยต3kC!. 4 magnification may be in the range of l-l000 of the. Because the two-transistor Fr guard base connected - mine death o, they were neat sodium 3. 9V two pipe confidence vote, so that the common-mode input voltage is reduced, then the generic OP amplifier characteristics can not be used, should be noted o VRs differential amplifier transistor collector drop resistance Ri and Rz series for offset adjustment. If there is enough after the circuit zero drift, you can not VRZo in a multistage amplifier circuit to reduce the magnification if, it would have a vibration. End, and therefore need to add a phase compensation circuit (mouth, and,.), Component parameters from the minimum gain decision stingy

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