Oscillators – Automatic frequency stabilization using a phase or frequency... – Transistorized controls
Patent
1987-02-27
1989-02-21
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Transistorized controls
331 17, 328127, H03L 700, G06G 718
Patent
active
048068802
ABSTRACT:
A circuit comprising three stages, a differential input stage, a store and integrate stage, and a differential output stage. Both input and output stages are co-operative with enable/disable switching, which switching is controlled by timing signals provided externally to control the periods of integration and data reading. The store and integrate stage comprises a pair of transistors and individual current sources, charge being integrated by a capacitor connected between the transistors. At the end of each period of integration the capacitor may be discharged via these sources, or, parallel sources and a further switch may be added to allow separate reset and hole period provision. Such circuits may be combined and timed out in phased sequence for fastest operation. They may be incorporated in Costas phase-locked loops and used as a means of communication data recovery.
REFERENCES:
patent: 3839679 (1974-10-01), Hughes
patent: 3906214 (1975-09-01), Hess
patent: 3973212 (1976-08-01), Walloch
patent: 4361811 (1982-11-01), Ormond
LaRoche Eugene R.
Pasca Robert J.
Plessey Overseas Limited
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