APPARATUS AND METHODS FOR SIGNAL GENERATION, RECEPTION, AND SELF-CALIBRATION

摘要

Apparatus and methods for signal generation, reception, and calibration involving quadrature modulation and frequency conversion. Embodiments of the present invention provide extremely wide bandwidth, high spectral purity, versatility and adaptability in configuration, and ease of calibration, and are particularly well-adapted for use in integrated circuitry.

主权项

1. A signal-generating apparatus comprising:
a quadrature modulation block comprising:
a first digital-to-analog converter for receiving digital signals corresponding to an in-phase waveform component;a second digital-to-analog converter for receiving digital signals corresponding to a quadrature waveform component;a first anti-aliasing low-pass filter receiving an output of the first digital-to-analog converter;a second anti-aliasing low-pass filter receiving an output of the second digital-to-analog converter;a first mixer receiving an output of the first anti-aliasing low-pass filter;a second mixer receiving an output of the second anti-aliasing low-pass filter;a 90° splitter having an input, an in-phase output for mixing at the first mixer, and a quadrature output for mixing at the second mixer;a first frequency synthesizer having an output to the input of the 90° splitter;a summing unit for summing an output of the first mixer with an output of the second mixer; and a third mixer receiving an output of the summing unit of the quadrature modulation block; a second frequency synthesizer having an output to the third mixer; and a switch having an output selectable between the output of the summing unit and an output of the third mixer.