| 摘要 |
A Hall effect sensing element is formed as a surface device (22) that forms part of an integrated circuit. Coupled to the Hall effect stage is a current source (21) and a regulating circuit (24-27) that maintains a constant thickness barrier layer formed over the active zones of the Hall effect stage. The regulator circuit has a monitoring stage (24) that provides an actual valve to supply a differencing stage (26,27) which also receives the output from a reference valve stage (25). The differencing stage consists of a differential amplifier (26) and inverting amplifier (27) coupled in series. The monitoring stage has a control circuit (28), switch (29), inverter (30) and voltage follower. |
