公开(公告)号：US3582799A

公开(公告)日：1971-06-01

申请号：US3582799D

申请日：1969-08-25

Applicant: GEN DYNAMICS CORP

Inventor： REID TERENCE PATRICK

IPC: H03D3/04 ,  H03D3/14

CPC classification number: H03D3/04 ,  H03D3/14

Abstract: An FM signal discriminator circuit is described having a pair of emitter follower transistors of complementary symmetry cross coupled to each other. The output is taken at a base to emitter junction of one of the transistors so that voltage drops across the base to emitter junctions cancel, thereby enhancing linearity and temperature stability of the circuit. Discriminating action is obtained by transfer of charge between capacitors, one of which is contained in a charging circuit connected between the cross coupled transistors. The voltage across the last-mentioned capacitor is a function of the frequency of an input signal.