Mixed analog/digital, FIR/IIR realization of a linear-phase lowpassfilter |
| |
| Authors: | Qiuting Huang |
| |
| Affiliation: | Integrated Syst. Lab., Swiss Federal Inst. of Technol., Zurich; |
| |
| Abstract: | A 5 kHz linear-phase lowpass filter is implemented in a 2-μm BiCMOS technology as a combination of sigma-delta front-end, a digital shift register, a switched capacitor (SC) summer circuit with 50 input capacitors, and an SC biquad running at a 1 MHz clock. The measured group delay variation in the passband is less than 1 μs and the measured total harmonic distortion (THD) is -80 dB for an input sine wave amplitude of 0.7 V at 1 kHz. The circuit consumes 80 mW from ±5 V supply and measures 8.12 mm2 without pads |
| |
| Keywords: | |
|
|
