Flexible hybrid structure tunable for different telecom market solutions
AssigneeIntegration Associates Inc.
InventorWayne Holcombe
Life of this patent
Estimating the term…
Abstract
A hybrid circuit for use with a transformer includes a differential transmit amplifier having first and second input terminals for receiving a signal to be transmitted and a pair of output terminals that may be coupled to the transformer. The hybrid circuit also includes a summing node receive amplifier having an input terminal that may be coupled to the transformer and an output terminal that is accessible external to the hybrid circuit. The differential transformer provides for improved transmit amplitude when a low supply voltage is used. The externally accessible output of the summing node receive amplifier provides for adjustment of the receive gain to improve dynamic range and for tuning of the hybrid for different circuit requirements.
Claims10
A hybrid circuit for use with a transformer, the circuit comprising:
- an integrated circuit having first, second, third and fourth external interface pins;
- a summing node receive amplifier having a first input terminal coupled to the first external interface pin, a second input terminal coupled to a power supply source, and an output coupled to the second external interface pin, such that the summing node receive amplifier may be coupled to the transformer and a gain and impedance of the summing node receive amplifier may be determined using external components;
- a differential transmit amplifier having first and second input terminals for receiving a signal to be transmitted, a first output terminal coupled to the third external interface pin, and a second output terminal coupled to the fourth external interface pin, such that the differential transmit amplifier may be coupled to the transformer and to the receive amplifier.
A method for providing a hybrid circuit for use with a transformer, the method comprising the steps of:
- fabricating a summing node receive amplifier in an integrated circuit, where the summing node receiver has an input terminal and an output terminal accessible external to the integrated circuit;
- fabricating a differential transmit amplifier in the integrated circuit, where the transmit amplifier has first and second output terminals that are accessible external to the integrated circuit;
- coupling the summing node receive amplifier and differential transmit amplifier to the transformer using external discrete circuit elements.
Dependencies are inferred from the claim text.