Switching Element Including Power MOS Component Having Low Impedance and Low Resistance
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15
The figure shows a switching element for switching low impedance or resistance. The low resistance characteristics of this switching element are achieved by means of power MOS (metal oxide semiconductor) switching component. The circuit can be advantageously used to replace a relay. Relays are commonly used for switching low impedance or resistance, for example, in a line-interface circuit, because bipolar transistors or diodes circuits need complex isolated current drive. Indeed, to get a low AC resistance compared to 100 ohms, the drive current value must be greater than 30 mA. Also, it must not disturb the line in DC or AC mode; thus, two opposite and matched current generators must be used. Thus, this circuit is complex, has a greater consumption, and is critical for power supply noise rejection to the line in HF.