Circuit arrangement for signal detection having current mirror with cascode coupled transistors
First Claim
1. A circuit arrangement for detecting a received signal, comprising:
- a rectifier having an input adapted to have a received signal applied thereto and having an output adapted to provide a rectified signal;
a signal capacitor connected to said output of said rectifier;
a signal evaluating circuit connected to said signal capacitor; and
a discharge current sink that is connected to said signal capacitor and that comprises a current mirror circuit comprising plural transistors circuit-connected with one another in a cascode arrangement.
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Accused Products
Abstract
A circuit arrangement for detecting a received signal includes a rectifier with an input connected to a receiving antenna for rectifying an encoded received signal, a signal capacitor connected to an output of the rectifier, a discharge current sink connected to the signal capacitor, and a signal evaluating circuit connected to the signal capacitor. The discharge current sink includes a current mirror circuit of cascode-connected transistors. Thereby, the discharge current is substantially independent of the signal voltage over a larger range of voltages. This signal detection circuit is useful in transponders or remote sensors that receive and detect a signal transmitted by a base station.
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Citations
14 Claims
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1. A circuit arrangement for detecting a received signal, comprising:
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a rectifier having an input adapted to have a received signal applied thereto and having an output adapted to provide a rectified signal; a signal capacitor connected to said output of said rectifier; a signal evaluating circuit connected to said signal capacitor; and a discharge current sink that is connected to said signal capacitor and that comprises a current mirror circuit comprising plural transistors circuit-connected with one another in a cascode arrangement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification