A compact mixer and DAC for implementation of a direct conversion OQPSK transmitter

A compact low power circuit for implementation of a direct conversion OQPSK modulator is proposed. The circuit consists of a digital to analog converter, a low pass filter and an up-converter mixer. By embedding these three blocks, the circuit performance is enhanced and the total power consumption...

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Bibliographic Details
Main Authors: Chahardori, M., Mehrmanesh, S., Zamanlooy, B., Atarodi, M.
Format: Conference Proceeding
Language:English
Subjects:
Circuit optimization
CMOS technology
Digital to Analog
Digital-analog conversion
Energy consumption
Gilbert cell
Inductors
Linearity
Low pass filters
Low-Pass Filter
OQPSK modulator
Power supplies
Transconductance
Transmitters
Up-converter Mixer
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Description
Summary:A compact low power circuit for implementation of a direct conversion OQPSK modulator is proposed. The circuit consists of a digital to analog converter, a low pass filter and an up-converter mixer. By embedding these three blocks, the circuit performance is enhanced and the total power consumption is reduced. The mixer is designed base on a Gilbert cell with on chip inductor loads. Instead of transconductance transistors of Gilbert cell, a fully deferential current mode DAC is used and proficiently a low pass filter is embedded between them and therefore the linearity of total system is improved. All of circuits are designed based on 0.18 mum CMOS technology with a single 1.8 volt power supply.
ISSN:2159-3442
2159-3450
DOI:10.1109/TENCON.2007.4429101