Receiver

摘要

A receiver includes an internal antenna installed on a substrate and capable of receiving a wireless signal, and an external antenna connected to a connector, which is arranged on the substrate, and capable of receiving the wireless signal. A demodulator is arranged on the substrate and demodulates the wireless signals received through the internal antenna and the external antenna. An applying circuit is arranged on the substrate and applies a voltage to the external antenna via the connector. A disconnection detector is arranged on the substrate and detects whether the external antenna is disconnected based on a voltage or current applied by the applying circuit. The internal antenna forms a part of the applying circuit.

主权项

1. A receiver comprising:
an internal antenna installed on a substrate and configured to receive a wireless signal; an external antenna connected to a connector, which is arranged on the substrate, and configured to receive the wireless signal; a demodulator arranged on the substrate and configured to demodulate the wireless signals received through the internal antenna and the external antenna; an applying circuit arranged on the substrate and configured to apply a voltage to the external antenna via the connector; and a disconnection detector arranged on the substrate and configured to detect whether the external antenna is disconnected based on a voltage or current applied by the applying circuit, wherein the internal antenna forms a part of the applying circuit, the applying circuit includes a first path in which a first circuit and a second circuit are connected in series via the connector, and a second path connected in parallel to the first path, the first circuit includes the internal antenna and a first resistor connected in series to the internal antenna, the second circuit includes the external antenna and a second resistor connected in series to the external antenna, the first path includes a connection line which connects the internal antenna and the connector and which is set to a high impedance state, and the disconnection detector is arranged in the second path.