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A wideband large dynamic range and high linearity U-band RF front-end for mobile DTV is introduced,and includes a noise-cancelling low-noise amplifier(LNA),an RF programmable gain amplifier(RFPGA) and a current communicating passive mixer.The noise/distortion cancelling structure and RC post-distortion compensation are employed to improve the linearity of the LNA.An RFPGA with five stages provides large dynamic range and fine gain resolution.A simple resistor voltage network in the passive mixer decreases the gate bias voltage of the mixing transistor,and optimum linearity and symmetrical mixing is obtained at the same time.The RF front-end is implemented in a 0.25 μm CMOS process.Tests show that it achieves an ⅡP3(third-order intercept point) of –17 dBm,a conversion gain of 39 dB,and a noise figure of 5.8 dB.The RFPGA achieves a dynamic range of –36.2 to 23.5 dB with a resolution of 0.32 dB.
A wideband large dynamic range and high linearity U-band RF front-end for mobile DTV is introduced and includes a noise-canceling low-noise amplifier (LNA), an RF programmable gain amplifier (RFPGA) and a current communicating passive mixer. The noise / distortion canceling structure and RC post-distortion compensation are employed to improve the linearity of the LNA. An RFPGA with five dynamic range and fine gain resolution. A simple resistor voltage network in the passive mixer decreases the gate bias voltage of the mixing transistor, and optimum linearity and symmetrical mixing is obtained at the same time. The RF front-end is implemented in a 0.25 μm CMOS process. Tests show that it achieves an Ⅱ P3 (third-order intercept point) of -17 dBm , a conversion gain of 39 dB, and a noise figure of 5.8 dB. The RFPGA achieves a dynamic range of -36.2 to 23.5 dB with a resolution of 0.32 dB.