Broadband Balun-LNA Employing Local Feedback gm-Boosting Technique and Balanced Loads for Low-Power Low-Voltage Applications

초록

A new low-voltage and low-power noise-cancelling method that employs the local feedback gm-boosting and balanced loads is proposed by developing a design for a low-noise and low-power balun-low-noise amplifier (LNA) for low-power broadband applications. A common-gate (CG) - common-source (CS) balun-LNA with a modified current-bleeding (CBLD) technique has low noise performance and differential balanced output but consumes more power. Because local feedback boosts the overall gm of the CG stage using the amount of loop gain, the current consumption and supply voltage requirements can be mitigated. In addition, the cross-coupled cascode stage acts as a differential current balancer to improve the gain and phase mismatches at the differential output. Implemented in a 65-nm CMOS technology, the balun-LNA achieves a noise figure of 2.3 - 3 dB, a maximum voltage gain of 27.5 dB and a S11 of less -10 dB over the frequency range of 50 MHz to 1.3 GHz. The measured OIP3 and OIP2 are 25.3 dBm and 45.3 dBm, respectively. It consumes 5.7 mA from a nominal supply voltage of 1 V while the active die area is 0.046 mm(2).

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