Feedforward Active Decoupling for Supply Transient Compensation
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Summary
Problems
Conventional integrated circuits suffer from losses due to resistive voltage drops and voltage changes caused by package inductances, necessitating a method to actively compensate for supply transients beyond static decoupling.
Innovation solutions
A boost circuit supplies current from a higher voltage source, using a replica circuit and current mirror to generate a boost current that compensates for voltage changes and resistive drops, with optional use of an on-chip low dropout regulator or a boost capacitor to manage parasitic inductances.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a capacitor is used for static decoupling, then the circuit can handle some supply transients, but the decoupling is insufficient for large time-varying current consumption
Why choose this principle:
The feedforward active decoupling circuit predicts and compensates for supply transients before they affect the LNA by using a replica circuit to model the current consumption pattern and generate compensating current in advance, rather than waiting for the transients to occur
Principle concept:
If a capacitor is used for static decoupling, then the circuit can handle some supply transients, but the decoupling is insufficient for large time-varying current consumption
Why choose this principle:
A replica circuit is created that copies the current consumption characteristics of the LNA, allowing the decoupling circuit to simulate and compensate for the actual current variations without directly interfering with the LNA operation
Application Domain
Data Source
AI summary:
A boost circuit supplies current from a higher voltage source, using a replica circuit and current mirror to generate a boost current that compensates for voltage changes and resistive drops, with optional use of an on-chip low dropout regulator or a boost capacitor to manage parasitic inductances.
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., 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., LNA 108).