Current-mode bidirectional input/output buffer for impedance matching
US6275066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2000 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Apr 7, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/018592
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current-mode bidirectional input/output buffer circuit for impedance matching and operation at a high speed. The current-mode bidirectional input/output buffer circuit communicates with an external chip having the same current-mode bidirectional input/output buffer. In the buffer, a transmitting-receiving average voltage output unit converts an average current value between a transmission signal to be transmitted to the external chip and a receiving signal transmitted from the external chip, into an average voltage. A reference voltage output unit converts a reference current value selectively generated according to a voltage level of the transmission signal, into a reference voltage. A comparator compares the voltage from the transmitting-receiving average voltage output unit to the voltage from the reference voltage output unit to provide a logic signal corresponding to the received signal transmitted from the external chip. A bias voltage generator generates a bias voltage such that the impedance of each output unit is matched with a characteristic impedance of a transmission line coupled to the external chip, and provides the bias voltage to the transmitting-receiving average…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.