Reverd Nested Miller Compensation With V oltage Buffer and Nulling Resistor Kin-Pui Ho,Cheong-Fat Chan,Chiu-Sing Choy,and Kong-Pang Pun
Abstract—This paper prents a new reverd nested Miller
compensation technique for multistage operational amplifier
(opamp)design.The new compensation technique inverts the sign
of the right half complex plane zero and shifts the frequency of
the complex conjugate poles to a higher frequency.Simulation
results indicate that the gain-bandwidth product and ttling
luciano pavarottitime are improved by factors of two and three,respectively,
without degrading stability and power consumption.To verify
the propod technique,a three-stage opamp is fabricated with
0.6-
Fig.2.Schematic diagram of the propod amplifier.
Fig.3.Small-signal model of the amplifier using the improved compensation network. completely eliminated by introducing a nulling resistor.More-
over,adjustment of the nulling resistance
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TABLE II
N ULLING R ESISTOR S ENSITIVITY C OMPARISON
by(2).To further prove that the new technique does not require a
元音和辅音perfect match of the nulling resistor,we simulated a three-stage
opamp in which the nulling resistor’s value varied by
昆明在线[1],[2],where
,which will reduce the ttling time of the
amplifier.
III.E XPERIMENTAL R ESULTS
We designed two three-stage opamps with the conventional
reverd nested Miller and improved reverd nested Miller
compensation techniques that are shown in Fig.2,using
0.6-
m CMOS technology.A mi-
crophotograph of the test chip is shown in Fig.4.The mea-
surement results are summarized in Table IV.The measured
gain-bandwidth product is equal to19.46MHz,which is con-
sistent with the post-layout simulation result.However,there
is a13-dB difference between the simulated and measured dc
gain.We believe the difference is caud by the measurement
method.We extracted the dc gain by forcing the opamp into os-cillation using positive feedback[8].The dc gain was extracted from the measured oscillation frequency and the values of the passive feedback components.We ud this indirect measure-ment method becau our limited equipment prevented us from doing a direct dc gain measurement.
IV.C ONCLUSION
We have prented the design,operating principles,and measurement results of a three-stage opamp using improved reverd nested Miller compensation.The compensation technique includes the sign inversion of a right half complex plane zero and the frequency multiplication of a pair of complex conjugate poles.The new compensation technique substantially improves the bandwidth,ttling time,and slew rate of a conventional reverd nested Miller compensated opamp.The measured results that are listed in Table III match the simulation results that are listed in Table IV.For example, the measured GBP is19.46MHz and the simulated GBP is 19.6MHz.Thus,we conclude that the new compensation technique can improve the GBP and ttling time by factors of two and three,respectively.
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