Active load with adjustable common-mode level
First Claim
1. A differential circuit, comprising:
- an active load that provides a differential output signal at respective output terminals of the active load; and
a bias circuit that provides bias to the active load, and configured to provide an adjustable common-mode voltage at the respective output terminals of the active load.
7 Assignments
0 Petitions
Accused Products
Abstract
A differential preamplifier includes an active load with adjustable common-mode output level. The active load includes a transistor pair, a resistor pair, and a current source. The transistor load is employed to provide high gain, low offset, and a large bandwidth for the differential preamplifier. The resistor pair and current source are used to increase the common-mode output level of the differential preamplifier and to bias the transistor load. The current source can be varied to provide an adjustable common-mode output level suitable for driving next stage devices. The active load design allows the differential preamplifier to operate using only low power voltage supplies and with small-sized transistors.
8 Citations
18 Claims
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1. A differential circuit, comprising:
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an active load that provides a differential output signal at respective output terminals of the active load; and
a bias circuit that provides bias to the active load, and configured to provide an adjustable common-mode voltage at the respective output terminals of the active load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
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8. A differential circuit, comprising:
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a first transistor pair; and
an active load, coupled to the first transistor pair, including;
a second transistor pair having differential output terminals; and
a bias circuit that provides bias voltages to the second transistor pair, and configured to provide an adjustable common-mode voltage at the respective output terminals of the active load. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16)
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17. A differential circuit, comprising:
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a first stage configured to receive a differential input signal; and
a second stage, coupled to an output of the first stage, including;
an active load having a transistor pair that provides a differential output signal at respective output terminals of the active load; and
means for providing an adjustable common-mode voltage at the respective output terminals of the active load. - View Dependent Claims (18)
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Specification