Apparatus and method for a combination D/A converter and FIR filter employing active current division from a single current source
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United States of America Patent
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Nov 30, 1999
Issued Date -
N/A
app pub date -
Sep 12, 1995
filing date -
Feb 16, 1995
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Abstract
An active current steering semi-digital FIR filter for a digital-to-analog conversion circuit, which includes a shift register having a 1-bit digital input stream and a plurality of output taps, where each output tap provides a 1-bit signal which has a value of a logic 1 or a logic 0, and a plurality of current paths, where each path includes an active element, such as a transistor, having a relatively high output impedance, which is connected to a common current source, and to an op amp for current-to-voltage conversion. The relatively high output impedance of the active current steering element causes any error term resulting from offset at the op amp inputs to be minimized.
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