公开(公告)号：DE3379352D1

公开(公告)日：1989-04-13

申请号：DE3379352

申请日：1983-12-12

Applicant: MOTOROLA INC

Inventor： SMITH MICHAEL

IPC: G05F1/56 ,  G05F3/26 ,  G05F3/30 ,  G05F3/20

Abstract: A current source circuit which provides an output bias current having reduced error is disclosed. The current source has reference voltage and reference current portions coupled together for providing a reference current to an amplifier means. A buffer portion is coupled to the amplifier means and to a bias current portion for substantially increasing the output impedance of the amplifier portions thereby decreasing the effect of power supply variation on the output bias current.

公开(公告)号：SG23095G

公开(公告)日：1995-08-18

申请号：SG23095

申请日：1995-02-11

Applicant: MOTOROLA INC

Inventor： SMITH MICHAEL ,  WHATLEY ROGER A ,  OLESIN ANDREW S

IPC: H03K19/0175 ,  H03K19/0185 ,  H03K19/094 ,  H03K19/092

Abstract: An input buffer circuit having a single input for receiving input voltages characterized by having varying voltage swings is provided. First and second inverter circuits having differing switchpoint voltages are coupled to a level shifting position. The level shifting portion varies the level of swing of the input voltage and buffers the input voltage. In one form, voltage coupling circuitry is interposed between the level shifting portion and a latching portion which provides the input voltage as an output signal at a predetermined voltage level. In another form, voltage coupling circuitry controlled by control circuitry couples the output of the level shifting portion to an output in response to the input voltage.