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An integrated fifth-order continuous-time low-pass filter for a WiMedia ultrawideband radio receiver is described in this paper. The prototype filter is realized with a passive pole at the filter input and a fourth-order leapfrog filter in which the gm-C technique with pseudodifferential transconductors is used. The transconductors do not include internal nodes, and they are designed to have a nominal...
This paper describes a direct-conversion receiver for WiMedia UWB applications. The receiver consists of separate BG1 and BG3 LNAs including a 2.4-GHz notch filter, quadrature mixers, a base-band gm-C low-pass filter with variable gain, and a fast-hopping synthesizer. The UWB receiver is targeted for a mobile handset and therefore special emphasis has been placed on the reduction of interferers. The...
A base-station receiver, which is capable of receiving from one to four adjacent WCDMA channels, is described in this paper. The receiver is designed to drive high-resolution Nyquist-rate A/D converters and it can be used as a direct-conversion receiver (DCR) or as a low-IF receiver in WCDMA bands I-III. The low-IF NF is 2.7/3.0 dB for the channels centered at 7.5 MHz and 2.5 MHz, respectively. The...
The design of a high linearity current-mode mixer, which is targeted for base-station (BS) direct-conversion receiver, is described in this paper. Several different configurations based on the Gilbert cell mixer are compared to achieve a high input referred third-order interception point (IIP3) performance with a low noise figure (NF). According to the simulations the designed mixer achieves +15-dBm...
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