| 摘要 |
An apparatus and method provide an adjustable phase and time delay to an input signal. The apparatus includes an inverting element and first and second variable capacitors. The inverting element has a first end serially coupled with the input signal and a second end. The first variable capacitor is coupled between the first end of the inverting element and first voltage. The second variable capacitor is coupled between the second end of the inverting element and a second voltage. The first and second variable capacitors are separately adjustable to controllably vary a phase shift and a delay of a reflection of the input signal. The first and second voltages may be at the same or different potentials.The input signal may be coupled to the inverting element through a directional coupler, such as a circulator. The input signal, which is reflected by the inverting element, may be coupled back through the directional coupled and output as the output signal having a desired phase shift and delay relative to the input signal.
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