Driver circuit and method for driving a signal
AssigneeLantiq Deutschland GmbH
InventorsAndreas Wiesbauer, Sergio Walter, Alexander Kahl, David San Segundo Bello
Life of this patent
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Abstract
Driver circuit for driving a transmit signal for a line comprising a signal amplifier which delivers a transmit signal, present at a signal input of the signal amplifier, amplified with a gain to a signal output, a line interface circuit which is connected between the signal output of the signal amplifier and the line, and comprising a hybrid circuit which is connected to the line interface circuit, wherein the hybrid circuit suppresses the transmit signal and couples a received signal received via the line to a signal input of the signal amplifier for the purpose of impedance synthesis.
Claims21
A driver circuit for driving a transmit signal for a line, comprising:
- (a) a signal amplifier which delivers a transmit signal, present at a signal input of the signal amplifier, amplified with a gain to a signal output;
- (b) a transformer, a secondary winding of which can be coupled to the line and a primary winding of which has a first terminal that is connected to the signal output of the signal amplifier and a second terminal that is connected to a terminating impedance;
- and
- (c) at least one hybrid circuit which has a first feedback impedance which feeds back the first connection of the primary winding to the signal input of the signal amplifier and has a second feedback impedance which feeds back the second connection of the primary winding to the signal input of the signal amplifier.
A driver circuit for driving a transmit signal for a telephone line, comprising:
- (a) a signal amplifier which amplifies a transmit signal, present at a signal input of the signal amplifier, with a gain and delivers it to a signal output;
- (b) a filter which filters high-frequency signal disturbances of the amplified transmit signal in accordance with a filter transfer function;
- (c) a transformer, the secondary winding of which can be coupled to the telephone line and the primary winding of which has a first terminal which is connected to the filter and a second terminal which is connected to a terminating impedance;
- (d) a first feedback loop which feeds back the first connection of the primary winding to the signal input of the signal amplifier via a first feedback resistor;
- (e) a second feedback loop which feeds back the second connection of the primary winding to the signal input of the signal amplifier via a second feedback impedance;
- (f) wherein the ratio of the resistance values of the two feedback impedances is such that the gain is independent of the filter transfer function of the filter.
A hybrid circuit for a transceiver which couples out a received signal received via a line and adds it to a transmit signal of the transceiver at a summation node for the purpose of impedance synthesis of an output impedance of the transceiver.
A driver circuit for driving a transmit signal for a line, comprising:
- (a) a signal amplifier which delivers a transmit signal, present at a signal input of the signal amplifier, amplified with a gain to a signal output;
- (b) a line interface circuit which is connected between the signal output of the signal amplifier and the line, the interface circuit at least including a transformer and a terminating impedance, the transformer having at least one terminal coupled to the terminating impedance;
- and
- (c) a hybrid circuit which is connected to the line interface circuit, wherein the hybrid circuit suppresses the transmit signal and couples a received signal received via the line to a signal input of the signal amplifier for the purpose of impedance synthesis.
A method for driving a transmit signal, in which a transmit signal is amplified and coupled into a line, wherein a received signal received via the line is coupled out and added to the transmit signal for the purpose of impedance synthesis.
Dependencies are inferred from the claim text.