| 摘要 |
FIELD: radioengineering. SUBSTANCE: invention can find use in design of high-quality radio receivers of frequency-modulated signals of broadcasting and communication assignment. Proposed receiver has input circuit 1, matching amplifier 2, suppression filter 3, controlled high-frequency amplifier 4, mixer 5, D. C. amplifier 6, heterodyne 7 connected in series and high-frequency amplifier 8 of automatic gain control circuit, amplitude detector 9 and D. C. amplifier 10 of automatic gain control circuit also connected in series. Symmetric output of heterodyne 7 is connected to second symmetric input of mixer 5 which symmetric output is linked to symmetric input of D.C. amplifier 6. Symmetric input of high-frequency amplifier 8 of automatic gain control circuit is linked to points of connection of symmetric output of controlled high-frequency amplifier 4 and first symmetric input of mixer 5. Output of D. C. amplifier 10 of automatic gain control is connected to controlling input of controlled high-frequency amplifier 4. Output of D.C. amplifier 6 is output of proposed receiver designed to hook up high-quality amplifier of audio frequency. EFFECT: expanded application field, high operational reliability, stability of reception and qualitative reproduction. 1 dwg |
