| 摘要 |
Switching elements (38,40,42,44) have auxiliary clock signal inputs to receive clock signals. A selector circuit (46) receives a control signal from a control signal generator (2), and selects one of the switching elements, allowing one of the clock signals onto a common output (18). The control signal has a variable amplitude and polarity. The selector circuit comprises a logic control circuit, analogue switch and analogue selector which continuously tracks the amplitude and polarity of the control signal to select and activate the control output (48,50,52,54) responsible for switching a switching element.
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