Regulated supply for voltage controlled oscillator

Details Regulated supply for voltage controlled oscillator Regulated supply for voltage controlled oscillator

1996-06-03

1997-11-11

Grimm, Siegfried H.

Oscillators

Ring oscillators

331177R, 331186, H03L 500

Patent

active

056868677

ABSTRACT:
A monolithic CMOS phase-lock loop (PLL) circuit provides a high frequency of operation suitable for RF applications. The PLL produces an output clock with high spectral purity and very low jitter. The output clock has a low static phase error relative to a reference input, making the PLL useful for clock synchronizing applications, such as clock recovery elements in transmission/recording channels. The PLL provides in-phase and quadrature signals from a voltage controlled oscillator (VCO) which has two differential transconductors. The second differential transconductor has a positive input coupled to a positive output of the first differential transconductor, a negative input coupled to a negative output of the first differential transconductor, a positive output coupled to a negative input of the first differential transconductor, and a negative output coupled to a positive input of the first differential transconductor. Each differential transconductor has a negative output impedance. Each differential transconductor includes a current controlled transconductor circuit (CCXG) and a voltage-current converter coupled to a first supply node for providing a current to the CCXG responsive to a voltage applied to a voltage control input of the differential transconductor.

REFERENCES:
patent: 5180995 (1993-01-01), Hayashi et al.

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