Synchronous carrier recovery circuit and injection locked oscill

Details Synchronous carrier recovery circuit and injection locked oscill Synchronous carrier recovery circuit and injection locked oscill

1998-01-30

2000-10-17

Mis, David

Oscillators

With synchronizing, triggering or pulsing circuits

331116FE, 331158, 329324, 329346, 375326, 455255, H03B 536, H03D 300, H03D 302, H03L 724

Patent

active

061338028

ABSTRACT:
A simple carrier recovery circuit capable of accurately detecting and synchronizing an incoming carrier frequency without the use of a phase locked loop (PLL) is provided. Instead of a PLL, the carrier recovery circuit includes an injection locked oscillator. The injection locked oscillator includes an input for connection to the received modulated signal. The gain of an inverter stage of a amplifier in the injection locked oscillator is modulated by the received modulated signal using an injection transistor connected between the power source and the output of the inverter stage. The gate of the injection transistor receives a signal corresponding to the received modulated signal.

REFERENCES:
patent: 3794760 (1974-02-01), Moriki
patent: 4064468 (1977-12-01), Kumata
patent: 5075643 (1991-12-01), Einbinder
patent: 5650749 (1997-07-01), Main

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