公开(公告)号：CA1178338A

公开(公告)日：1984-11-20

申请号：CA393948

申请日：1982-01-12

Applicant: MOTOROLA INC

Inventor： ULMER RICHARD W ,  WHATLEY ROGER A

IPC: G05F1/56 ,  G05F3/30 ,  H03K3/26 ,  H03K17/60

Abstract: A temperature stable bandgap voltage reference source utilizing two substrate bipolar transistors biased at different emitter current densities is provided. Switched capacitors are used to input the Vbe and the .DELTA.Vbe of the transistors (NTC and PTC voltages, respectively) into an amplifier to provide a reference voltage VREF proportional to the weighted sum of the PTC and NTC voltages. Proper selection of the ratio of the switched capacitors renders the reference voltage VREF substantially independent of temperature. In a modified form of the reference, the reference amplifier is implemented by an auto-zeroed operational amplifier which uses switched capacitor techniques and an integrated capacitor to achieve the auto-zeroing function.

公开(公告)号：HK85495A

公开(公告)日：1995-06-09

申请号：HK85495

申请日：1995-06-01

Applicant: MOTOROLA INC

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

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

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.

公开(公告)号：CA1160698A

公开(公告)日：1984-01-17

申请号：CA387008

申请日：1981-09-30

Applicant: MOTOROLA INC

Inventor： WHATLEY ROGER A

IPC: H01L29/94 ,  G05F1/56 ,  G05F3/20 ,  G05F3/24 ,  G05F3/26 ,  H03K17/60 ,  G05F3/16 ,  H03L5/00

Abstract: BIAS CURRENT REFERENCE CIRCUIT A bias current reference circuit is disclosed having a diode-connected bipolar device connected in series with an MOS device to develop a reference voltage which is proportional to a bias current. The reference voltage is used by an MOS device connected in series with a resistor to develop a reference current which is proportional to the reference voltage. The reference current is used by a diode-connected MOS device to develops a bias voltage which is proportional to the reference current. The bias voltage in turn is used by another MOS device to develop the bias current in proportion to the bias voltage. The bias voltage is also used by other MOS devices to provide similar bias currents. In the disclosed embodiment, such a bias current is used by a complementary diode-connected MOS device to develop a complementary bias voltage. The complementary bias voltage may be used to develop start-up bias current in the event the bias current reference circuit fails to provide a suitable bias voltage.

公开(公告)号：CA1158727A

公开(公告)日：1983-12-13

申请号：CA390633

申请日：1981-11-23

Applicant: MOTOROLA INC

Inventor： WHATLEY ROGER A

IPC: H03F1/32 ,  H03F3/20 ,  H03F3/213 ,  H03F3/30 ,  H03F3/16 ,  H03F3/18 ,  H03F3/45

Abstract: DRIVER CIRCUIT HAVING REDUCED CROSS-OVER DISTORTION A driver circuit (10) suitable for use in an operational amplifier, includes a bipolar pull-up transistor (36) which sources current to an output terminal (38) in proportion to an applied drive current, and an MOS pull-down transistor (48) which sinks current from the output terminal (38) in proportion to an applied control voltage. An MOS drive transistor (32) provides a constant drive current for the pull-up transistor (36), and an MOS shunt transistor (44) shunts the drive current away from the bipolar transistor (36) in proportion to the control voltage. A cross-over compensation circuit (14) develops a predetermined bias voltage on the base of the bipolar transistor (36) relative to the voltage on the output terminal (38), to assure a minimum level of operation of the bipolar transistor (36) when the output terminal (38) is near the analog ground voltage.

公开(公告)号：IT1144541B

公开(公告)日：1986-10-29

申请号：IT4991481

申请日：1981-12-15

Applicant: MOTOROLA INC

Inventor： WHATLEY ROGER A

IPC: H03F1/32 ,  H03F3/20 ,  H03F3/213 ,  H03F3/30 ,  H03F

Abstract: A driver circuit suitable for use in an operational amplifier, includes a bipolar pull-up transistor which sources current to an output terminal in proportion to an applied drive current, and an MOS pull-down transistor which sinks current from the output terminal in proportion to an applied control voltage. An MOS drive transistor provides a constant drive current for the pull-up transistor, and an MOS shunt transistor shunts the drive current away from the bipolar transistor in proportion to the control voltage. A cross-over compensation circuit develops a predetermined bias voltage on the base of the bipolar transistor relative to the voltage on the output terminal, to assure a minimum level of operation of the bipolar transistor when the output terminal is near the analog ground voltage.

公开(公告)号：DE3273265D1

公开(公告)日：1986-10-23

申请号：DE3273265

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: G05F1/56 ,  G05F3/30 ,  H03K3/26

公开(公告)号：CA1201491A

公开(公告)日：1986-03-04

申请号：CA464599

申请日：1984-10-03

Applicant: MOTOROLA INC

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

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

Abstract: INPUT BUFFER CIRCUIT FOR RECEIVING MULTIPLE LEVEL INPUT VOLTAGES An input buffer circuit (10) having a single input for receiving input voltages (VIN) characterized by having varying voltage swings is provided. First (12 and 15) and second (16 and 18) inverter circuits having differing switchpoint voltages are coupled to a level shifting portion (13, 17). The level shifting portion varies the level of swing of the input voltage (VIN) and buffers the input voltage (VIN). In one form, voltage coupling circuitry (22, 23) is interposed between the level shifting portion and a latching portion (25, 26) which provides the input voltage (VIN) as an output signal at a predetermined voltage level. In another form, voltage coupling circuitry (48, 53) controlled by control circuitry (49, 50, 57) couples the output of the level shifting portion (43, 44) to an output in response to the input voltage (VIN).

公开(公告)号：IT8149914D0

公开(公告)日：1981-12-15

申请号：IT4991481

申请日：1981-12-15

Applicant: MOTOROLA INC

Inventor： WHATLEY ROGER A

IPC: H03F1/32 ,  H03F3/20 ,  H03F3/213 ,  H03F3/30 ,  H03F

Abstract: A driver circuit suitable for use in an operational amplifier, includes a bipolar pull-up transistor which sources current to an output terminal in proportion to an applied drive current, and an MOS pull-down transistor which sinks current from the output terminal in proportion to an applied control voltage. An MOS drive transistor provides a constant drive current for the pull-up transistor, and an MOS shunt transistor shunts the drive current away from the bipolar transistor in proportion to the control voltage. A cross-over compensation circuit develops a predetermined bias voltage on the base of the bipolar transistor relative to the voltage on the output terminal, to assure a minimum level of operation of the bipolar transistor when the output terminal is near the analog ground voltage.

公开(公告)号：WO1982001776A1

公开(公告)日：1982-05-27

申请号：PCT/US1981001423

申请日：1981-10-23

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  WHATLEY ROGER A

IPC: G05F03/16

CPC classification number: G05F3/267

Abstract: Un circuit de reference a courant de polarisation (10) possede un dispositif bipolaire a connexion par diode (20) connectee en serie avec un dispositif MOS (22) pour developper une tension de reference qui est proportionnelle a un courant de polarisation. La tension de reference est utilisee par un dispositif MOS (24) connecte en serie avec une resistance (26) pour developper un courant de reference qui est proportionnel a la tension de reference. Le courant de reference est utilise par un dispositif MOS a connexion par diode (28) pour developper une tension de polarisation qui est proportionnelle au courant de reference. La tension de polarisation a son tour est utilisee par un autre dispositif MOS (30) pour developper le courant de polarisation proportionnellement a la tension de polarisation. La tension de polarisation est egalement utilisee par d'autres dispositifs MOS (32) pour produire des courants de polarisation identiques. Dans le mode de realisation decrit, un tel courant de polarisation est utilise par un dispositif MOS a connexion par diode complementaire (34) pour developper une tension de polarisation complementaire. La tension de polarisation complementaire peut etre utilisee pour developper un courant de polarisation de demarrage dans le cas ou le circuit de reference a courant de polarisation (10) est defaillant et n'arrive pas a produire une tension de polarisation appropriee.

公开(公告)号：WO1982002804A1

公开(公告)日：1982-08-19

申请号：PCT/US1982000094

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  KELLEY STEPHEN HARLOW ,  ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03F01/02

CPC classification number: H03F1/303

Abstract: Une source de tension de reference a espace inter-bandes independante de la temperature utilise des transistors bi-polaires (12 et 14) polarises avec des densites de courants emetteurs differentes. Des condensateurs commutes (28 et 34) sont utilises pour entrer Vbe et (Alpha)Vbe des transistors (12 et 14) (tensions PTC et NTC, respectivement), dans un amplificateur operationnel (42) pour obtenir une tension de reference VREF proportionnelle a la somme des tensions PTC et NTC. La selection appropriee du rapport des condensateurs commutes (28 et 34) rend la tension de reference (VREF) sensiblement independante de la temperature. Dans une forme modifiee de la reference (10), l'amplificateur de reference (22) est actionne par un amplificateur operationnel a auto-zero (42) qui utilise des techniques de condensateurs commutes et un condensateur integre (44) pour obtenir la fonction de remise a zero automatique.