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US 7,924,079 B2Granted
Baseline restore based on diode star configuration and transformer coupling
AssigneeSiemens Medical Solutions USA, Inc.
InventorsMatthias J. Schmand, Nan Zhang
Life of this patent
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Abstract
A simple, low cost circuit with only passive components, and thus low power consumption, is provided for baseline restoration of an AC coupled signal. The circuit includes a passive network of diodes arranged in a star configuration and an RF-transformer. A differential signal strategy may be employed by including a differential amplifier at the input and output of the passive network.
Claims14
A circuit comprising:
- a passive network having first and second input terminals coupled to an AC signal path, the passive network comprising:
- a plurality of star connected diodes comprising:
- a first diode having a first terminal coupled to the first input terminal and a second diode having a first terminal coupled to the second input terminal, the first and second diodes each having a second terminal connected at a star junction;
- a third diode having a first terminal connected to a first intermediate terminal and a fourth diode having a first terminal connected to a second intermediate terminal, the third and fourth diodes each having a second terminal connected to the star junction;
- and
- a pair of output terminals coupled to a DC signal chain,
- wherein the passive network is configured to restore baseline shift.
4 more elements
A method comprising:
- transmitting a signal through a passive network, the network comprising plural star connected diodes and having an input for receiving an AC capacitive coupled signal and an output for transmitting a DC coupled signal;
- and
- performing baseline restoration.
Dependencies are inferred from the claim text.