A reconfigurable negative group delay circuit (NGDC) with tunable group delay flatness is presented. The proposed NGDC is composed of an amplifier, three series resistors connecting with two transmission lines, two varactors, and a diode. By shorting different resistors through the diode, different negative group delay (NGD) times can be obtained. Two varactors are utilized to tune the flatness of the group delay. For verification, an NGDC is designed, fabricated, and measured at the center frequency of 1.0 GHz. The measured NGD time is tuned from −2.0 to −5.8 ns. The flat‐NGD bandwidth varies from 2.2 to 8.8 with ±8 group‐delay fluctuation. And the insertion loss varies from 6.5 to 13.8 dB.
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机译：提出了一种具有可调群延迟平坦度的可重构负群延迟电路（NGDC）。所提出的NGDC由一个放大器、三个连接两条传输线的串联电阻、两个变容二极管和一个二极管组成。通过二极管短接不同的电阻器，可以获得不同的负群延迟 （NGD） 时间。使用两个变容二极管来调整群延迟的平坦度。为了进行验证，在1.0 GHz的中心频率下设计、制造和测量NGDC。测得的NGD时间在−2.0至−5.8 ns范围内调谐。平坦NGD带宽在2.2%至8.8%之间变化，群延迟波动±8%。插入损耗从 6.5 dB 到 13.8 dB 不等。
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