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Feedforward active decoupling

A technology of power supply and current source, applied in data processing power supply, amplifier with semiconductor device/discharge tube, instrument, etc., can solve problems such as insufficient

Inactive Publication Date: 2014-03-19
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Capacitor C1 is usually used to perform static decoupling, however, for many applications this is not sufficient

Method used

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  • Feedforward active decoupling
  • Feedforward active decoupling
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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0028] figure 2 An example of an IC is shown. As shown, IC202-1 has similar components to IC102, but IC202-1 also includes a boost circuit capable of providing power from VBSTDC (either on-chip or off-chip, but for this example shown as off-chip ) current to compensate for voltage variations due to package inductance 204 (typically bond wire inductance) and resistive voltage drops. Power supply VBSTDC generally also provides a higher voltage than power supply 106 . To accomplish this, the replica circuit (i.e., transistor Q2) can draw current from a current source 206-1 (which can be a substantially constant current source) that is supplied by the input circuit (i.e., LNA 108) A replica of the current ICKT IRPL. Typically, transistor Q2 can be 1 to N times the size of a transistor receiving enable signal EN, such as transistor Q1, so that it can have the same or proportional duty cycle current as, for example, transistor Q1 without high frequency signal components. This r...

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Abstract

Apparatus and methods are provided to compensate for parasitic inductances and resistance (such as from package bonding wires) that affect current in duty cycle systems, such as low noise amplifiers (LNAs), that have large varying current consumption. A boost circuit supplies current from a supply VBSTDC to compensate for voltage changes due to a package inductance 204 and resistive voltage drops. To accomplish this, a replica circuit (i.e., a transistor Q2) is able to source a current from current source 206-1 (which can be a generally constant current source) that is a replica IRPL of the current ICKT sourced by the input circuit (i.e., a LNA 108).

Description

technical field [0001] The present invention relates generally to regulating power supplies, and more particularly to compensation of power supply transients in duty cycled systems. Background technique [0002] Turning to FIG. 1 , an example of a conventional integrated circuit (IC) 102 can be seen. This IC 102 mainly includes the input circuit (for this example, the input circuit is a low noise amplifier or LNA 108 ), which has a large time-varying current consumption. As shown in this example, LNA 108, represented by NMOS transistor Q1 and resistor R1, is coupled between two power supply rails VDDA and VSS (which is coupled to power supply 106), and receives an enable signal EN. Typically, the enable signal EN consists of a stream of pulses (which are typically 1 ns out of every 10 ns). During operation, the LNA 108 (and other input circuits) can experience losses due to resistive voltage drops as well as voltage changes due to package inductance 104, and because of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/04G05F1/00
CPCG06F1/26H03F1/305H03F3/195H03F3/72H03F2200/294H03F2200/453H03F2200/456H03F2200/459H03F2203/7215
Inventor B·P·金斯堡V·B·伦塔拉S·拉马斯瓦米B·赫龙E·石
Owner TEXAS INSTR INC