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We present an inductorless circuit technique for a CMOS limiting amplifier (LA), which consists of an input buffer, third-order broadband gain stages, and an output buffer for driving 50-Ω transmission lines. By employing stream-mode active feedback with negative capacitance circuit (NCC), the bandwidth of the proposed circuit can be effectively enhanced while maintaining a flat frequency response within the −3 dB bandwidth. Based on TSMC 0.18-μm CMOS process, the proposed LA circuit is optimized and implemented. The measurement results shown that the −3 dB bandwidth is 7.2GHz with a voltage gain of 41 dB, and a data rate of 9Gb/s is successfully achieved. The fluctuation of the group delay is less than 225 ps, and the maximum output voltage is 1Vpp. The measured noise figure of the LA circuit is about 10 dB. Due to the absence of spiral inductors, the die only occupies a core size of 0.3 × 0.2mm2, and consumes 79mW from a 1.8V supply voltage.

An inductorless CMOS limiting amplifier with stream-mode active feedback