Voltage controlled oscillator power supply noise rejection

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United States of America Patent

PATENT NO 11705895
SERIAL NO

17834897

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An apparatus comprises a first circuit, a second circuit, a first transistor, a second transistor, a third transistor, a first programmable resistance, and a second programmable resistance. The first circuit may be configured to generate a reference signal and a bias signal in response to a supply voltage and a first input signal. The first circuit generally provides supply noise rejection to variations in the supply voltage. The second circuit may be connected to the first circuit and a ring oscillator. The first transistor may be connected to the first circuit and configured to set a first reference current of the first circuit based on the first input signal and the first programmable resistance. The second transistor may be connected in parallel with the first transistor. The second transistor is generally diode-connected. The third transistor may be connected to the first circuit and configured to set a second reference current of the first circuit based on the first input signal and the second programmable resistance. The first circuit generally forms a current mirror with the second circuit. The second circuit may be configured to provide a programmable current ratio for the current mirror based on a value of a second input signal.

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Patent Owner(s)

Patent OwnerAddress
AMBARELLA INTERNATIONAL LP3101 JAY STREET SANTA CLARA CA 95054

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Yueh Chun Cupertino, US 6 10

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