# US 7,746,097 B2 · Transceiver having an adjustable terminating network for a control device

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- Number: US 7,746,097 B2
- Document ID: US7746097B2
- Status: Granted
- Kind: B2
- Application number: 11/884,409
- Filed: 2005-12-02
- Published: 2009-06-25
- Granted: 2010-06-29
- Earliest claimed: 2005-02-24
- Assignees: Volkswagen Aktiengesellschaft
- Inventors: Klaus Lange; Carsten Schanze
- Web page: https://patentgrep.com/patent/US7746097B2

## CPC

- H04L 25/0298: {Arrangement for terminating transmission lines}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

In a transceiver for a control unit having a transceiver core for adapting the level of messages received or to be sent, an adjustable terminating network is situated in the transceiver that makes it possible to adjust at least two connection resistance values, the terminating network and the transceiver core being monolithically integrated in a semiconductor circuit.

## Claims

### Claim 1

A transceiver for a control unit, comprising:
a transceiver core configured to adjust a level of messages at least one of (a) received and (b) to be sent; and
an adjustable terminating network, at least three terminating resistance values adjustable via the terminating network, the terminating network and the transceiver core monolithically integrated in a semiconductor circuit;
wherein the at least three terminating resistance values include high resistance, approximately characteristic impedance, and approximately half characteristic impedance.

### Claim 2 (depends on 1)

The transceiver according to claim 1, further comprising two terminals configured to connect to a two-wire bus system.

### Claim 3 (depends on 2)

The transceiver according to claim 2, wherein two first terminating resistors are connected in series between the terminals, two second terminating resistors are connected in series between the terminals, and two third terminating resistors are connected in series between the terminals, center taps of the series-connected first terminating resistors, the series-connected second terminating resistors and the series-connected third terminating resistors electrically connected together, the second terminating resistors and the third terminating resistors are switchable at least one of (a) on and (b) off.

### Claim 4 (depends on 3)

The transceiver according to claim 3, further comprising at least one of (a) switches and (b) fuses associated with the terminating resistors.

### Claim 5 (depends on 4)

The transceiver according to claim 4, wherein the switches are arranged as transistors.

### Claim 6 (depends on 3)

The transceiver according to claim 3, wherein the two second terminating resistors and the two third terminating resistors include resistance values approximately equal to characteristic impedance.

### Claim 7 (depends on 3)

The transceiver according to claim 3, wherein when the two first terminating resistors are switched on, the two second terminating resistors are switched off, and the two third terminating resistors are switched off, the terminating resistance value is high resistance.

### Claim 8 (depends on 3)

The transceiver according to claim 3, wherein when the two first terminating resistors are switched on, the two second terminating resistors are switched on, and the two third terminating resistors are switched off, the terminating resistance value is approximately equal to characteristic impedance, such that the transceiver exhibits decentralized termination.

### Claim 9 (depends on 3)

The transceiver according to claim 3, wherein when the two first terminating resistors are switched on, the two second terminating resistors are switched on, and the two third terminating resistors are switched on, the terminating resistance value is approximately equal to half characteristic impedance, such that the transceiver exhibits centralized termination.

### Claim 10 (depends on 1)

The transceiver according to claim 1, further comprising a supporting network monolithically integrated in the semiconductor circuit with the terminating network and the transceiver core.

### Claim 11 (depends on 1)

The transceiver according to claim 1, further comprising a filter monolithically integrated in the semiconductor circuit with the terminating network and the transceiver core.