公开(公告)号：KR850001539B1

公开(公告)日：1985-10-16

申请号：KR810001732

申请日：1981-05-19

Applicant: MOTOROLA INC

Inventor： PACE GARY LEE

IPC: H03H11/12 ,  H03H11/04

公开(公告)号：DE3167378D1

公开(公告)日：1985-01-10

申请号：DE3167378

申请日：1981-03-13

Applicant: MOTOROLA INC

Inventor： PACE GARY LEE

IPC: H03F1/24 ,  H03F3/191 ,  H03F3/195 ,  H03H11/12 ,  H03H11/48

公开(公告)号：AT110501T

公开(公告)日：1994-09-15

申请号：AT88900736

申请日：1987-12-14

Applicant: MOTOROLA INC

Inventor： PACE GARY LEE

IPC: H03M1/18 ,  H03K5/08 ,  H03M1/12 ,  H04L25/03 ,  H04L25/06 ,  H04Q7/14 ,  H03M1/00

公开(公告)号：MX150293A

公开(公告)日：1984-04-10

申请号：MX18725881

申请日：1981-05-12

Applicant: MOTOROLA INC

Inventor： PACE GARY LEE

IPC: H03H11/12 ,  H03H11/04 ,  H03G5/16

Abstract: A configuration of two transistors and two capacitors provides a current mode second-order active filter for IC implementation with low-pass, bandpass and high-pass capabilities. The filter frequency is tunable over a wide range, independently of filter Q and gain, by varying a DC bias current. The filter can provide one-port impedance functions, and two-port voltage, current and impedance transfer functions. With the addition of a second biasing current source, the filter Q can be controlled by adjusting the ratio of the two biasing current sources. Enhanced dynamic range and large-signal performance can be achieved by the addition of linear resistors, with trade-offs in tunable frequency range and frequency linearity.

公开(公告)号：EP0052117A4

公开(公告)日：1982-09-10

申请号：EP81901224

申请日：1981-03-13

Applicant: MOTOROLA INC

Inventor： PACE GARY LEE

IPC: H03H11/12 ,  H03H11/04 ,  H03F1/24 ,  H03F3/191

CPC classification number: H03H11/1213