AMPLITUDE DETECTOR Russian patent published in 1997 - IPC

FIELD: radio engineering, in particular, receivers. SUBSTANCE: device has input phase- inverting circuit 12 which is made from first and second transistors with emitter coupling. Other terminals of resistors of collector circuits of first and second transistors are joined. In addition device has output circuit which is made from third and fourth transistors 1, 2, load circuit which is designed as parallel circuit of resistor 3 and capacitor. In addition device has first, second, third and fourth additional resistors 8, 7, 5 and 6, capacitors 9, 10, 11, 17 and 18, voltage scaling circuit which has serial circuit of resistors 13 and 14, temperature-sensitive element which is designed as parallel circuit of transistors 15 and 16 in diode connection. Conductance direction of both transistors is same as conductance of third and fourth transistors 1 and 2. One terminal of first additional transistor is connected to positive terminal of power supply. Second terminal of first additional transistor is connected to joined terminals of resistors from collector circuits of transistors of input phase-inverting circuit 12. Third and fourth additional resistors 5 and 6 are connected in series and inserted between bases of third and fourth transistors 1 and 2. Input phase-inverting circuit 12 and output circuit are connected in series with respect to alternating current. Voltage scaling circuit is connected to power supply input through temperature-sensitive element. EFFECT: increased stability of gain against temperature alternations. 3 cl, 1 dwg