Duane Morris LLP
Quadrature LC voltage controlled oscillator with opposed bias and coupling control stages
A voltage controlled oscillator unit is provided with cross coupled voltage controlled oscillators to generate quadrature phases. One control stage adjusts coupling between the oscillators. Another control stage adjusts the tail current that applies operating bias to the oscillators and to the couplers, respectively. The cross coupling and tail current control stages are arranged so that tuning one simultaneously and oppositely tunes the other for simultaneous adjustment in opposite directions. This limits the power consumption of the oscillator unit throughout the range of frequency control.
Agere Systems, Inc.
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H03L H03L H03B
inventional inventional inventional
Jinghong
Chen