Fully integratable voltage controlled oscillator (VCO) circuit

Details Fully integratable voltage controlled oscillator (VCO) circuit Fully integratable voltage controlled oscillator (VCO) circuit

1999-03-01

2000-06-27

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331117R, 331117FE, 331117D, 331177V, H03B 512, H03B 518

Patent

active

060811676

ABSTRACT:
A fully integratable voltage controlled oscillator (VCO) circuit includes a tuned circuit having a spiral inductance connected in parallel with a varactor controlled by a control voltage. Damping of the tuned circuit is counteracted by a cross-coupled NIC (Negative Impedance Converter). The cross-coupling of the NIC, which transforms a negative resistance into the tuned circuit, is provided by AC coupling of two outputs. Bipolar transistors are provided only for current source transistors, while in contrast CMOS transistors are provided in a current switch. The VCO can be used, for example, in DECT units.

REFERENCES:
patent: 5434544 (1995-07-01), Van Veenendaal
patent: 5847621 (1998-12-01), Gutierrez
patent: 6016082 (2000-01-01), Cruz et al.
"A Balanced 1.5Ghz Voltage Controlled Oscillator with an Integrated LC Resonator", Leonard Dauphinee et al., 1997 IEEE International Solid-State Circuits Conference, pp. 390-391.
"Silicon Bipolar VCO Family for 1.1 to 2.2GHz with Fully-Integrated Tank and Tuning Circuits", Bart Jansen et al., 1997 IEEE International Solid-State Circuits Conference, pp. 392-393.
"A 1.8-GHz CMOS Low-Phase-Noise Voltage-Controlled Oscillator with Prescaler", Jan Craninckx et al., IEEE Journal of Solid-State Circuits, vol. 30, No. 12, 1995, pp. 1474-1482.
"Oscillators with Low Phase Noise and Power Consumption", Ulrich Rhode et al., Communications Quarterly, 1996, pp. 29, 37 and 43.

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