High performance analog charge pumped phase locked loop...

Details High performance analog charge pumped phase locked loop... High performance analog charge pumped phase locked loop...

2007-01-23

2007-01-23

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S017000, C331S167000

Reexamination Certificate

active

10955064

ABSTRACT:
The present invention achieves technical advantages as a high performance analog charge pumped phase locked loop (PLL)(10) with process and temperature compensation in closed loop bandwidth. The PLL reduces the variation in bandwidth and stability by making the product KVCO*ICPindependent of process and temperature variation. The PLL achieves a higher performance than existing PLL architectures, achieving a high dynamic range up to at least 110 dB, such that a PWM class-D amplifier is realizable with this PLL. The PLL has a constant bandwidth and damping factor while using an analog charge pump (16).

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Wang et al., “Low Phase Noise SiGe Voltage-controlled Oscillators for Wireless Applications”,□□Microwave Journal, Feb. 2002, pp. 84, 86, 88, 91, 93, 95, 96, and 99 (8 pages).

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