A quadrature modulator with enhanced harmonic rejection filter

Proceedings. IEEE Asia-Pacific Conference on ASIC,（2002）

Cited 6|Views4

No score

Abstract

When using a current-commutating quadrature modulator in a wireless transmitter, undesired spurs are generated at 3fLO, 5fLO, and so on, thus requiring a good filter to suppress those unwanted signals. By using the non-ideal characteristic of the non-zero output resistance of the amplifier in a Sallen-Key filter, a second order low-pass filter with transmission zeros is proposed. In this paper, the filter is designed and simulated using a 0.35 μm SiGe BiCMOS model provided by TSMC. The designed 4th-order low-pass filter with a parasitic pole, implemented by cascading two biquads and an amplifying stage, outperformed a 9th-order AC-coupled RC low-pass filter not only in size, but also in suppression characteristics and current consumption.

Translated text

Key words

amplifier nonzero output resistance,sallen-key filter,harmonics suppression,fourth-order low-pass filter,sallen-key filter.,0.35 micron,second order low-pass filter,but also in suppression characteristics and current consumptions. keywords wireless transmitter,radio transmitters,harmonic rejection filter,sige,transfer functions,undesired spurs,bicmos analogue integrated circuits,current-commutating quadrature modulator,low-pass filters,transmission zeros,wireless transmitter,tsmc,poles and zeros,biquads,biquadratic filters,modulators,low-pass filter not only in size,parasitic pole,linear network synthesis,enhanced harmonic rejection filter,sige bicmos model,frequency,sallen key filter,second order,q factor,transmitters,band pass filters,low pass filter,low pass filters

AI Read Science

Must-Reading Tree

Example

Generate MRT to find the research sequence of this paper

Chat Paper

Summary is being generated by the instructions you defined