Ring oscillator using even numbers of differential stages with current mirrors
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United States of America Patent
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Jan 21, 1997
Grant Date -
N/A
app pub date -
Jan 17, 1996
filing date -
Jan 17, 1996
priority date (Note) -
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Abstract
A ring oscillator having an even number of differential amplifier stages is disclosed wherein each stage includes a differential amplifier using two N-channel MOSFETs whose gates serve as the inputs and whose drains serve as the outputs of the stage. The sources of the two MOSFETs are connected together and to a current sink consisting of a cascoded structure of N-channel MOSFETs. The drains of each of the two N-channel MOSFETs serving as the differential amplifier are each connected to a respective current source provided by a P-channel MOSFET. All of the current sinks in the stages are connected as secondary legs of a first current mirror which establishes a current of I in the sinks. All of the current sources are connected as secondary legs of a second current mirror which attempts to establish a current of (1+.varies.)I/2 in each of the sources, where .varies. is a number greater than zero. Since an average current of only I/2 can be drawn from each of the current sources, the voltage drop across each current source is reduced, thereby limiting the range of the average common mode output voltage for each stage of the oscillator.
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