Analog phase shifter using cascaded voltage tunable capacitor

Details Analog phase shifter using cascaded voltage tunable capacitor Analog phase shifter using cascaded voltage tunable capacitor

2007-10-02

2007-10-02

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Delay lines including a lumped parameter

C333S164000, C333S171000

Reexamination Certificate

active

11288723

ABSTRACT:
A circuit topology is configured to flatten out a phase- and amplitude-response over a specified range of frequencies. The circuit topology also provides a large cumulative phase-shift. In one embodiment, the circuit topology cascades a plurality of all-pass sections, with the center-frequencies of each all-pass section staggered to create a substantially flat phase-response over a frequency range. Further, in one embodiment the plurality of all-pass sections has at least one all-pass section that is different from another all-pass section. Each all-pass section includes a tunable capacitor and has a center-frequency that can be varied by electronically tuning the capacitor. Each center frequency is selected to obtain substantially constant amplitude and phase response over a desired frequency range and capacitance tuning range.

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