Bandpass Continuous-Time Delta-Sigma Modulator for Wireless Receiver IC
Keywords:
Analog-to-digital conversion, bandpass delta-sigma modulator, continuous-timeAbstract
Bandpass ADC is well known to be adopted in the
narrowband receiver design in order to reduce the system
complexity, increase integration and improve performance by
digitizing the bandpass signal directly without prior conversion
to baseband. A fully differential feedforward fourth-order
continuous-time bandpass delta-sigma modulator is presented.
The proposed single-bit modulator can receive 172.8kHz IF
signals by using an oversampling clock frequency of 5.53MHz
with an OSR of 128. Simulated result showing that dynamic
range of 78dB within bandwidth of 21.6kHz is achieved and the
current consumption is around 1.2mA at 1.5V power supply.
The design had been implemented in 0.13µm 1P6M CMOS
process with MIM capacitors.
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