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Inverting The Bipolar Differential Pair For Low-Voltage Applications, Bradley Minch
Inverting The Bipolar Differential Pair For Low-Voltage Applications, Bradley Minch
Bradley Minch
In this paper, the author presents a new bipolar differential transconductor that functions just like an emitter-degenerated differential pair, except for the following: it operates on a low power supply; it has a rail-to-rail common-mode input-voltage range; permits a wide output-voltage swing; has a transconductance gain that is nearly constant with the common-mode input voltage; and requires only n-p-n transistors in the signal path. We describe intuitively how the circuit functions and provide DC measurements from a prototype circuit, breadboarded from a quad TPQ3904 and a thick-film resistor array demonstrating proper operation on a single-ended 1.2-V power supply.
A Folded Floating-Gate Differential Pair For Low-Voltage Applications, Bradley Minch
A Folded Floating-Gate Differential Pair For Low-Voltage Applications, Bradley Minch
Bradley Minch
The author presents a new folded differential pair topology that is suitable for low-voltage applications. The new differential pair is made from floating-gate MOS (FGMOS) transistors and simultaneously provides a rail-to-rail common-mode input voltage range with a high rejection of the common-mode input voltage by keeping the sum of the two output currents fixed. Moreover, when biased in weak or moderate inversion, the allowable output voltage swing is also almost from rail-to-rail. The author discusses the operation of the circuit and some of the trade-offs involved in its design. He also shows experimental measurements from a version of the circuit, …
Evolution Of A Folded Floating-Gate Differential Pair, Bradley Minch
Evolution Of A Folded Floating-Gate Differential Pair, Bradley Minch
Bradley Minch
The author presents a folded floating-gate MOS (FGMOS) differential pair circuit that is capable of simultaneously providing a rail-to-rail common-mode input voltage range and a rail-to-rail output voltage swing with a low power-supply voltage. In this configuration, the voltage drop across the bias current source is folded up into the same range over which the output voltages swing, facilitating low-voltage operation. The floating-gate charge can be used to trim out the offset voltage of the differential pair and to reduce the required power-supply voltage for a given bias current level. The author provides both a qualitative description of how the …