Modified Current Mirror Circuit for Reduction of Switching Time

a current mirror circuit and switch time technology, applied in low-noise amplifiers, process and machine control, instruments, etc., can solve the problems of resistor negatively affecting performance parameters, extended transition period between, and insufficient power generation of the transmitter circuit itself. to achieve the effect of reducing the response time of the amplifier circui

Inactive Publication Date: 2019-12-19
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The modified circuit achieves significantly shorter transient response times while maintaining signal quality, improving the amplifier's performance by reducing the effective resistance during activation and deactivation states.

Problems solved by technology

In most cases, the transceiver circuitry itself does not generate sufficient power or have sufficient sensitivity necessary for communications.
More particularly, a low resistance value for the mirror resistor negatively affects performance parameters such as noise figure, while a high resistance value for the mirror resistor results in an extended transition period between the on and off states in the RF amplifier transistor.
In some prior implementations, a switch may short the RF amplifier transistor gate voltage to ground when turning off the transistor, but the transient response when turning on the transistor would not be improved.

Method used

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  • Modified Current Mirror Circuit for Reduction of Switching Time
  • Modified Current Mirror Circuit for Reduction of Switching Time
  • Modified Current Mirror Circuit for Reduction of Switching Time

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0031]The schematic diagram of FIG. 3 illustrates additional details of the amplifier circuit 10a. The primary amplifier 12 includes a primary amplifier transistor (TNRF) 20. A gate 20g of the primary amplifier transistor 20 is connected to a radio frequency signal input 22, a radio frequency signal therefrom being amplified by the primary amplifier transistor 20 in accordance with conventional principles known in the art. The radio frequency signal input 22 is connected to the gate 20g with a coupling capacitor (CRF) 24. The gate 20g is also understood to define a capacitance that is cumulative with the coupling capacitor 24.

[0032]Referring again to the block diagram of FIG. 1, the amplifier circuit 10 further includes a current mirror circuit 26 that sets the bias point of the primary amplifier 12. That is, the bias signal provided by the current mirror circuit 26 facilitates a quiescent state of the primary amplifier 12. As shown in FIG. 3, the current mirror circuit 26 includes ...

second embodiment

[0056]the amplifier circuit 10b similarly includes the first helper circuit 32 that is generally defined by the first helper transistor 34 that is connected in parallel across the bias resistor 30. As shown in FIG. 8, the bias resistor 30 may be split, with the main component 30a and the secondary component 30b. The first helper circuit 32, and hence the first helper transistor 34, is connected across the main component 30a only. The first helper circuit 32 is activated and deactivated in response to the first control signal 38 that is generated by the first helper control circuit 36, which is comprised of the first series capacitor 42 and the first shunt resistor 44. The first control signal 38 may be based upon a transient component of the enable logic signal 40 transitioning from the off state to the on state.

[0057]In the second embodiment 10b, the first inverter 56 and the second inverter 58 are utilized. The first inverter 56 is understood to receive the enable logic signal 40 ...

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Abstract

A current mirror circuit connectible to an amplifier circuit to set a bias point thereof includes a current mirror circuit, and a bias resistor connected thereto. The bias resistor is connectible to the amplifier circuit. A first helper circuit is connected in parallel with the bias resistor, and is selectively activated for a first predetermined duration by a first control signal. The activated first helper circuit defines a lower resistance path relative to the bias resistor to shorten a rising transient response of the amplifier circuit as the current mirror circuit is activated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The application relates to and claims the benefit under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 62 / 222,112 filed Sep. 22, 2015 and entitled “MODIFIED CURRENT MIRROR CIRCUIT FOR REDUCTION OF SWITCHING TIME,” the entire contents of which is wholly incorporated by reference herein.STATEMENT RE: FEDERALLY SPONSORED RESEARCH / DEVELOPMENT[0002]Not ApplicableBACKGROUND1. Technical Field[0003]The present disclosure relates generally to radio frequency (RF) circuitry, and more particularly, to modified current mirror circuits for reduction of switch time.2. Related Art[0004]Wireless communications systems are utilized in a variety contexts involving information transfer over long and short distances alike, and a wide range of modalities for addressing the particular needs of each being known in the art. As a general matter, wireless communications involve an RF carrier signal that is variously modulated to represent informatio...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04B1/40H03F3/193H03F3/24
CPCH04B1/40H03F3/245H03F2200/21H03F2200/451H03F3/193H03F1/0261H03F1/30H03F1/301H03F1/304H03F3/195H03F2200/18H03F2200/294G05F3/262H01L23/66H01L2223/6644
InventorMUSIOL, LOTHARLIU, YANGHESAMADDIN, PARHAMZHANG, LISETTE L.GORBACHOV, OLEKSANDR
OwnerSKYWORKS SOLUTIONS INC