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Controllable integrator

a technology of integrators and controllable components, applied in the field of integrators, can solve problems such as unsatisfactory switches, and achieve the effect of amplifying the effectiveness of capacitive components

Inactive Publication Date: 2004-03-09
MARVELL ASIA PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention allows for the selective switching of additional capacitive components into a circuit configuration without adding significant resistance. Additionally, controllable gain elements can be selectively controlled to amplify the effectiveness of capacitive components for a wide range of operating frequency characteristics of the circuit.

Problems solved by technology

However, such switches are not ideal in that they incorporate appreciable resistance into a circuit in the conductive state which can be detrimental to high frequency operating characteristics of the integrated circuit.

Method used

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  • Controllable integrator
  • Controllable integrator
  • Controllable integrator

Examples

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Embodiment Construction

Referring now to FIG. 1, there is shown a conventional integrator including a differential pair of gain stages 9, 11 such as field-effect transistors having control electrodes, or gates, coupled to receive control signals applied to inputs 13, 15. The source electrodes, or sources, of the gain stages are coupled together and to a controllable current source 17, and each of the drain electrodes, or drains, is coupled to a controllable current sources 19, 21 and to one or more capacitive elements 23, 25. The sum of the current sources 19, 21 is usually set equal to the current from source 17. Selected ones of the capacitive elements may be coupled to ground, for example, via links that may be removed via laser-beam machining to alter the operating frequency characteristics of the circuit. Alternatively, semiconductor switches may be substituted (not shown) for the links to facilitate control of capacitance in the circuit in response to externally applied signals. However, such semicon...

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PUM

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Abstract

Integrated circuitry for selectively introducing capacitance and for controlling the transconductance transfer function of one or more amplifiers includes concatenated differential amplifiers with one or more pairs of switchable capacitive components differentially connected across outputs of the differential amplifiers to facilitate operation over a wide range of operating frequencies under control of external signals.

Description

FIELD OF THE INVENTIONThis invention relates to integrators and more particularly to circuitry in an integrated circuit that controls frequency response characteristics over a wide range of frequencies with adjustable capacitance and controllable transconductance.BACKGROUND OF THE INVENTIONCircuit components formed in integrated circuits commonly exhibit wide variations in operating characteristics attributable to variations in the semiconductor processes that form the integrated circuit of such components. By traditional design practices, additional or redundant components may be formed in an integrated circuit during the processing phase, and such additional components may thereafter be connected in or out of a circuit using a laser beam to selectively sever connecting links as required to adjust the operating characteristics of the circuit. Alternatively, signal controllable switches may be incorporated into the design of the integrated circuit to selectively connect additional c...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06G7/00G06G7/184H03G1/00H03G5/10H03G5/00
CPCG06G7/184H03G1/0029H03G5/10
Inventor SUTARDJA, SEHATSUTARDJA, PANTAS
Owner MARVELL ASIA PTE LTD