Analogue switch
AssigneeZetex PLC
InventorsAlan James Dodd, Joseph Andrew Jenkins, Anthony Philip Sullivan
Life of this patent
Estimating the term…
Abstract
A switching circuit (20) comprising first and second switch terminals (2,3) and a switch (21). The switch (21) comprises a first bipolar transistor (22), having a collector connected to the first switch terminal (2) and an emitter connected to the second switch terminal (3), and a second bipolar transistor (23), having an emitter connected to the first switch terminal (2) and a collector connected to the second switch terminal (3). The switch (21) can be turned on by supply of a control current to the base of either the first or the second bipolar transistor.
Claims23
A switching circuit comprising:
- first and second switch terminals;
- a switch comprising a first bipolar transistor, having a collector connected to the first switch terminal and an emitter connected to the second switch terminal, and a second bipolar transistor, having an emitter connected to the first switch terminal and a collector connected to the second switch terminal, such that the switch can be turned on by supply of a control current to the base of at least one of the first or the second bipolar transistor;
- and
- a slave switching circuit comprising:
- first and second slave terminals;
- a slave switch, the slave switch comprising a third bipolar transistor, having a collector connected to the first slave terminal and an emitter connected to the second slave terminal, and a fourth bipolar transistor, having an emitter connected to the first slave terminal and a collector connected to the second slave terminal;
- a first controlled current source having a programming input connected to the first slave terminal and a current output connected to the first switch terminal;
- and
- a second controlled current source having a programming input connected to the second slave terminal and a current output connected to the second switch terminal;
- wherein the slave switch can be turned on by supply of a slave control current to the base of at least one of the third or the fourth bipolar transistor.
Dependencies are inferred from the claim text.