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US 6,271,738 B1Granted
90° phase generator
AssigneeAgere Systems Guardian Corp.
InventorHiroyuki Kimura
Life of this patent
Estimating the term…
Abstract
A 90° phase generator comprises two mixers (M1.M2) whose inputs are cross-connected, a voltage controlled delay circuit (D) connected two inputs of the mixers, an integrator receiving the sum of the outputs from two mixers. The delay is maintained to 90° by controlling a control input of the voltage controlled delay circuit (D). By using the two mixers, the 90° phase generator can operate at high frequency while maintaining high accuracy.
Claims9
A phase generator, comprising:
- a delay circuit (D) for generating from an input signal (cos(ωt)) a delayed signal (cos(ωt+φ)) having a phase difference (φ) with respect to the input signal, the phase difference controlled by a control signal;
- a first mixer having first and second input terminals for receiving as respective inputs the input signal and the delayed signal, the first mixer for mixing the signals received at the first and second input terminals and providing a first mixer output;
- and
- a second mixer, substantially identical to the first mixer, the second mixer having first and second terminals for receiving as respective inputs the delayed signal and the input signal, the second mixer for mixing the signals received at the first and second terminals and providing a second mixer output, the first mixer output and the second mixer output forming the control signal.
1 more element
A phase generator, comprising:
- a first mixer (M1) having first and second input terminals, the first mixer for receiving an input signal (cos(ωt+φ)) at the first input terminal thereof and producing an output;
- a second mixer (M2) having first and second input terminals, the second mixer being substantially identical to the first mixer, the second mixer for receiving the input signal at the second input terminal thereof and providing an output;
- an integrator (S) for receiving and integrating the outputs from the first mixer (M1) and the second mixer (M2) and producing an integrator output;
- and
- a voltage controlled delay circuit for receiving the input signal, the voltage controlled delay circuit generating a delayed signal (cos(ωt+φ)) having a predetermined phase difference (φ) with respect to the input signal, and providing the delayed signal to a second input terminal of the first mixer (M1) and the first input terminal of the second mixer (M2), wherein the phase difference (φ) provided by the voltage controlled delay circuit is controlled by the integrator (S) output.
2 more elements
Dependencies are inferred from the claim text.