A CMOS dual-channel, 100-MHz to 1.1-GHz transmitter for cable applications

A dual-channel wide-band transmitter for cable applications is presented that has more than a decade frequency coverage. The chip consists of two parallel transmitters that are both fully operational from 100 MHz up to 1.1 GHz. Using a single-ended current-mode output topology, the radio-frequency (...

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Veröffentlicht in:IEEE journal of solid-state circuits 1999-12, Vol.34 (12), p.1904-1913
Hauptverfasser: Borremans, M.A.F., De Ranter, C.R.C., Steyaert, M.S.J.
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container_end_page 1913
container_issue 12
container_start_page 1904
container_title IEEE journal of solid-state circuits
container_volume 34
creator Borremans, M.A.F.
De Ranter, C.R.C.
Steyaert, M.S.J.
description A dual-channel wide-band transmitter for cable applications is presented that has more than a decade frequency coverage. The chip consists of two parallel transmitters that are both fully operational from 100 MHz up to 1.1 GHz. Using a single-ended current-mode output topology, the radio-frequency (RF) output signals are lossless combined by summing the output currents. The third-order harmonic of the oscillator signal is filtered by a wide-band polyphase filter. The complex filtering operation is mathematically described in this paper. The on-chip integrated oscillators have a measured 55-1200 MHz tuning range. Using the polyphase filter, a linear mixer topology, and a linear output driver, all distortion components are below -40 dBc. All intermodulation products of the two channels are smaller than -48 dBc. In this way, it is guaranteed that the parallel channels do not disturb the other channels in the frequency band even without any channel-specific filtering. Each channel delivers the designed -16-dBm RF output signal. The measured transmitter noise floor is situated at -139.8 dBc/Hz. The chip has been processed in a standard 0.5 /spl mu/m CMOS technology.
doi_str_mv 10.1109/4.808915
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ispartof IEEE journal of solid-state circuits, 1999-12, Vol.34 (12), p.1904-1913
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recordid cdi_proquest_miscellaneous_28197412
source IEEE Electronic Library (IEL)
subjects Cables
Channels
Chips
CMOS
CMOS technology
Distortion measurement
Filtering
Filtration
Oscillators
Power harmonic filters
Radio frequency
Radio transmitters
RF signals
Topology
Transmitters
Wideband
title A CMOS dual-channel, 100-MHz to 1.1-GHz transmitter for cable applications
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