Accurate bias tracking for process variation and power supply modulation
A bias and voltage source technology, applied in amplifiers with semiconductor devices/discharge tubes, electrical components, adjusting electrical variables, etc., can solve problems such as affecting the current mirror, node X voltage uncertainty, affecting the linear range of the PA core, etc.
Inactive Publication Date: 2016-07-20
MARVELL WORLD TRADE LTD
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- Description
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- Application Information
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Problems solved by technology
However the voltage at node X may be uncertain
Uncertainty in the voltage at node X makes node Y more or less than Vdd / 2, which affects the current mirror and thus the linear range of the PA core
Method used
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[0035] Embodiments of circuits for current mirrors and methods of circuit operation for current mirrors are described herein, wherein the current mirrors provide substantially accurate bias tracking for process variations and power supply modulation. Via accurate bias tracking, the current mirroring of the current mirror is improved and thus the linear range of the current mirror is increased. Thereby, a signal received by a current mirror according to an embodiment of the present invention may be power amplified relatively accurately and predictably.
[0036] In the following description, for purposes of illustration, numerous examples and specific details are set forth in order to provide a thorough understanding of embodiments of the invention. Particular embodiments defined by the claims may include some or all of the features of these examples, alone or in combination with other features described below, and may also include modifications and equivalents of the features a...
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A current mirror includes a bias branch comprising: a first transistor and a second transistor connected in series between a voltage source and ground; a voltage divider coupled between the voltage source and ground; and an operational amplifier, is configured to receive the divided voltage of the voltage divider and the voltage of the node between the first transistor and the second transistor, and drive the gate of the second transistor to pull the node towards the divided voltage. The current mirror also includes a power amplifier core coupled to the bias branch. The power amplifier core includes first and second drive transistors arranged in series between a voltage source and ground. The gates of the first transistor and the first driving transistor are coupled, and the gates of the second transistor and the second driving transistor are coupled.
Description
[0001] Cross References to Applications [0002] This application claims priority to U.S. Provisional Application No. 61 / 426,740, filed December 23, 2010, by Leong et al., entitled "AccurateBiasTrackingforProcessVariationandSupplyModulation," which is hereby incorporated by reference in its entirety for all purposes . technical field [0003] Embodiments of the present invention relate generally to current mirror circuits, and more specifically, embodiments of the present invention relate to accurate bias tracking for process variation and power supply modulation in current mirror circuits. Background technique [0004] Unless otherwise indicated herein, the approaches described in this section are not prior art to the claims in this application and are not admitted to be prior art by inclusion in this section. [0005] A current mirror is one that is configured to replicate the current in one leg of the circuit by controlling the current in the other leg of the circuit su...
Claims
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IPC IPC(8): G05F3/26H03F1/32
CPCG05F3/262H03F3/193H03F3/245H03F3/45179H03F2200/555H03F2203/45294H03F2203/45301H03F2203/45304H03F2203/45311H03F2203/45352H03F2203/45544H03F2203/45554H03F3/16
Inventor P·B·伦格N·K·K·玛尼姆
Owner MARVELL WORLD TRADE LTD