MICROPHONE BIASING CIRCUITRY AND METHOD THEREOF

摘要

A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias to a device microphone contact of the device connector via a biasing path. A capacitor is connected between a reference voltage node and a capacitor node of the biasing path. A first switch is located between the capacitor node and the device microphone contact. Detection circuitry detects disconnection of the peripheral connector and device connector; and control circuitry controls the switch to disable the biasing path.

主权项

1. A host device for use with a removable peripheral apparatus having a microphone, the host device comprising:
a device connector capable of forming a mating connection with a respective peripheral connector of the removable peripheral device, the device connector having a device microphone contact; a biasing path for supplying an electrical bias to said device microphone contact; a capacitor connected between a reference voltage node and a capacitor node of said biasing path; a first switch located in the biasing path between the capacitor node and the device microphone contact, said switch being operable to disable the biasing path; detection circuitry for detecting disconnection of the peripheral connector and device connector; and control circuitry for controlling said first switch to disable the biasing path in response to detection of disconnection of the peripheral connector and device connector.