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Linear transconductor for a one-cycle controller, notably for a DC-DC switching converter

A transconductor and linear technology, applied in the field of transconductors, can solve problems such as voltage conversion error instability, output operational amplifier gain reduction, etc.

Inactive Publication Date: 2008-08-20
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, however, when the op amp's output voltage tries to approach the supply voltage, the op amp's pMOS output transistor may be driven strongly into the triode region
As a result, the gain of the output op amp is drastically reduced, causing errors in the voltage conversion and / or causing instability

Method used

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  • Linear transconductor for a one-cycle controller, notably for a DC-DC switching converter
  • Linear transconductor for a one-cycle controller, notably for a DC-DC switching converter
  • Linear transconductor for a one-cycle controller, notably for a DC-DC switching converter

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Embodiment Construction

[0039] As mentioned above, the present invention firstly provides a new linear transconductor which is a part of an integrated circuit.

[0040] In the following description it is assumed that the linear transconductor according to the invention is part of an integrated non-inverting integrator which is an integrated single-cycle controller of an integrated DC-DC (switching) converter of an electronic device (or equipment) a part of. For example, such a DC-DC (switching) converter may be part of a battery powered or portable electronic device, such as a mobile phone (or cell phone), a cordless phone, a digital camera, an MP3 player or a personal digital assistant (PDA).

[0041] However, the present invention is not limited to these applications. In fact, linear transconductors can be used in any integrated circuit where a linear, stable and accurate transconductance (Gm) over an input voltage range of 0 to X volts is necessary, and whenever greater than the so-called It is ...

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Abstract

A linear transconductor (LT), for instance for a one-cycle controller (OC), comprises i) an operational amplifier (OA) having non-inverting (+) and inverting (-) inputs, a power supply input intended to be connected to a DC voltage (VBAT), and an output (OO), ii) a voltage divider means (Rl, R2) comprising a first terminal defining a transconductor non-inverting input (Vin+) and intended to be connected to a first voltage (Vx), and a second terminal connected to the operational amplifier inverting input (-), iii) a resistor (R3) comprising a first terminal defining a transconductor inverting input (Vin-) intended to be connected to a second voltage and a second terminal connected to the operational amplifier non-inverting input (+), iv) first (Tl) and second (T2) matched transistors having respective sources connected together and to the operational amplifier power supply input, respective common gates connected to the operational amplifier output (OO), and respective drains, the drain of the first transistor (Tl) being connected to the operational amplifier non-inverting input (+) and the drain of the second transistor (T2) defining a transconductor output.

Description

technical field [0001] This invention relates to the field of integrated circuits, and more precisely to transconductors used in certain integrated circuits. Background technique [0002] As known to those skilled in the art, transconductors are electronic devices that are often used in integrated circuits and, for example, in integrators, which are readily used, for example, in single-cycle controllers. [0003] A single-cycle controller is an integrated device that implements a recently proposed nonlinear control technique. For example, this device can be used in a DC-DC switching converter to take advantage of the pulse and nonlinear characteristics of the switching converter. One-cycle controllers are intended to obtain instantaneous dynamic control of the average value of a switching variable such as voltage. Since only one switching cycle is required for the mean value of the switching variable to reach a new steady state after a transient, single-cycle control offers...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor Z·王
Owner NXP BV
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