RF transceiver IC having internal loopback conductor for IP2 self test
US8606193B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2008 |
| Grant date | Dec 10, 2013 |
| Priority date | — |
| Expiry date | Mar 24, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D7/168
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An RF transceiver integrated circuit has a novel segmented, low parasitic capacitance, internal loopback conductor usable for conducting IP2 self testing and/or calibration. In a first novel aspect, the transmit mixer of the transceiver is a current mode output mixer. The receive mixer is a passive mixer that has a low input impedance. In the loopback mode, the transmit mixer drives a two tone current signal to the passive mixer via the loopback conductor. In a second novel aspect, only one quadrature branch of the transmit mixer is used to generate both tones required for carrying out an IP2 test. In a third novel aspect, a first calibration test is performed using one quadrature branch of the transmit mixer at the same time that a second calibration test is performed using the other quadrature branch, thereby reducing loopback test time and power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.