Phase lead compensation circuit for an integrated switching regulator
First Claim
Patent Images
1. A switching regulator circuit comprising:
- an output filter;
a switching circuit supplying a modulated waveform to said output filter, at least a portion of said switching circuit being formed as an integrated circuit; and
a phase lead compensation circuit connected between an output of said output filter and an input to said switching circuit, said phase lead compensation circuit being formed on the same integrated circuit as said portion of said switching circuit, said phase lead compensation circuit comprising;
a transconductance amplifier having a first input terminal coupled to receive a voltage corresponding to a voltage at said output of said output filter, having a second input terminal coupled to a reference voltage source, and having an output terminal; and
a frequency-dependent impedance, coupled to said output terminal of said transconductance amplifier, whose impedance varies as the frequency of a current output from said transconductance amplifier varies.
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Abstract
The invention allows a phase lead compensation circuit to be integrated on the same chip as a switching regulator. The invention provides additional phase to the loop gain of the monolithic switching regulator. The additional phase is required near the unity gain frequency of the loop gain and is not continued indefinitely. The desired phase lead compensation function can be accomplished through the use of a transconductance amplifier driving a frequency-dependent load. The transconductance amplifier converts a differential input voltage signal into a single-ended output current. This output current flows through the frequency-dependent load.
99 Citations
14 Claims
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1. A switching regulator circuit comprising:
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an output filter; a switching circuit supplying a modulated waveform to said output filter, at least a portion of said switching circuit being formed as an integrated circuit; and a phase lead compensation circuit connected between an output of said output filter and an input to said switching circuit, said phase lead compensation circuit being formed on the same integrated circuit as said portion of said switching circuit, said phase lead compensation circuit comprising; a transconductance amplifier having a first input terminal coupled to receive a voltage corresponding to a voltage at said output of said output filter, having a second input terminal coupled to a reference voltage source, and having an output terminal; and a frequency-dependent impedance, coupled to said output terminal of said transconductance amplifier, whose impedance varies as the frequency of a current output from said transconductance amplifier varies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification