Invention Grant
- Patent Title: Current controlled variable frequency oscillator having an improved operational transconductance amplifier
- Patent Title (中): 具有改进的运算跨导放大器的电流控制可变频率振荡器
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Application No.: US49938Application Date: 1993-04-20
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Publication No.: US5564089APublication Date: 1996-10-08
- Inventor: Raymond L. Barrett, Jr.
- Applicant: Raymond L. Barrett, Jr.
- Applicant Address: IL Schaumburg
- Assignee: Motorola, Inc.
- Current Assignee: Motorola, Inc.
- Current Assignee Address: IL Schaumburg
- Main IPC: H03B1/00
- IPC: H03B1/00 ; H03B5/24 ; H03F3/45 ; H04B1/26 ; H03B5/20
Abstract:
A current controlled variable frequency oscillator (260) operates at a characteristic frequency that is determined primarily by a scaled current. A filter cascade (320) receives the scaled current for setting a filter cascade frequency substantially equal to the characteristic frequency. Additionally, the filter cascade (320) receives a triangular signal at a non-inverting input, the filter cascade (320) converting the triangular signal into a sinewave signal. A lowpass filter (330) receives the scaled current for setting a lowpass filter frequency to a frequency substantially less than the characteristic frequency. The lowpass filter (330) also receives the sinewave signal and provides an average signal therefrom. A comparator (340) receives the scaled current, wherein the comparator (340) compares the sinewave signal and the average signal for providing a substantially squarewave signal therefrom. An integrator (310) is provided for receiving the scaled current, the integrator (310) integrating the substantially squarewave signal for providing the triangular signal therefrom.
Public/Granted literature
- USD383380S Duplex clip and holder Public/Granted day:1997-09-09
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