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A CMOS long-term evolution(LTE) direct convert receiver that eliminates the interstage SAW filter is presented.The receiver consists of a low noise variable gain transconductance amplifier(TCA),a quadrature passive current commutating mixer with a 25%duty-cycle LO,a trans-impedance amplifier(TIA),a 7th-order Chebyshev filter and programmable gain amplifiers(PGAs).A wide dynamic gain range is allocated in the RF and analog parts.A current commutating passive mixer with a 25%duty-cycle LO improves gain,noise,and linearity. An LPF based on a Tow-Thomas biquad suppresses out-of-band interference.Fabricated in a 0.13μm CMOS process,the receiver chain achieves a 107 dB maximum voltage gain,2.7 dB DSB NF(from PAD port),-11 dBm 11P3,and>+65 dBm UP2 after calibration,96 dB dynamic control range with 1 dB steps,less than 2%error vector magnitude(EVM) from 2.3 to 2.7 GHz.The total receiver(total I Q path) draws 89 mA from a 1.2-V LDO on chip supply.
A CMOS long-term evolution (LTE) direct convert receiver that eliminates the interstage SAW filter is presented. The receiver consists of a low noise variable gain transconductance amplifier (TCA), a quadrature passive current commutating mixer with a 25% duty-cycle LO , a trans-impedance amplifier (TIA), a 7th-order Chebyshev filter and programmable gain amplifiers (PGAs). A wide dynamic gain range is allocated in the RF and analog parts. A current commutating passive mixer with a 25% duty-cycle LO improves gain, noise, and linearity. An LPF based on a Tow-Thomas biquad suppresses out-of-band interference. Fabrication in 0.13 μm CMOS process, the receiver chain achieves a 107 dB maximum voltage gain, 2.7 dB DSB NF ( from PAD port, - 11 dBm 11P3, and> +65 dBm UP2 after calibration, 96 dB dynamic control range with 1 dB steps, less than 2% error vector magnitude (EVM) from 2.3 to 2.7 GHz.The total receiver (total IQ path) draws 89 mA from a 1.2-V LDO on chip supply.