Oscillators – Automatic frequency stabilization using a phase or frequency... – Transistorized controls
Patent
1981-11-16
1985-01-15
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Transistorized controls
331 17, 331108D, 331177R, H03K 303, H03J 704, H03K 3282
Patent
active
044940807
ABSTRACT:
A voltage-controlled oscillator (VCO) comprises a current controlled oscillator (ICO) and control circuitry which independently adjusts the gain (K.sub.v) and free-run or center frequency of the VCO. The control circuitry includes a first current source selected to set the free-run frequency of the VCO and a second current source selected to set the gain (K.sub.v) of the VCO. The current sources are coupled to a common node in a summing/difference configuration. The controlled current generated from the summing/difference configuration is delivered into the ICO. Independent current mirrors are utilized to supply controlled current into the node of the summing/difference configuration.
REFERENCES:
patent: 3611194 (1971-10-01), Codd et al.
patent: 3870971 (1975-03-01), Takahashi et al.
patent: 3886485 (1975-05-01), Takahashi
patent: 3904988 (1975-09-01), Hsiao
patent: 3946330 (1976-03-01), Takahashi
patent: 4007429 (1977-08-01), Cadabra
patent: 4068188 (1978-01-01), Yokoyama
patent: 4336508 (1982-06-01), Cole et al.
Anon, "Voltage Controlled Oscillator", IBM Technical Disclosure Bulletin, Jan. 1971, vol. 13, No. 8, pp. 2170-2171.
Cockburn Joscelyn G.
Hancock Earl C.
International Business Machines - Corporation
LaRoche Eugene R.
Paxman W. R.
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