Title:
【発明の名称】演算トランスコンダクタンス増幅器・キャパシタ対用の周波数同調システム
Document Type and Number:
Japanese Patent JP3316038
Kind Code:
B2
Abstract:
Based on the insight that the voltage-to-current ratio or gain of a capacitor (Z) at a particular reference frequency is the product of its capacitance value with said reference frequency, a tuning system is disclosed which tunes the characteristic integrator frequency (fc) of an OTA-C integrator by making the transconductance of the operational transconductance amplifier (OTA) thereof equal to the aforementioned gain at that characteristic frequency. Therefore, the tuning system includes a first tuning path in which the OTA (or a replica thereof) is included and a second tuning path including another amplifier (B-OTA) "degenerated" by the capacitor (Z) so as to produce the required gain. The gains of both these tuning paths are then equalized by matching means (MM) generating a frequency tuning signal (VTF) which is applied to both OTA and OTA-C.
Inventors:
Joanes Matilda Josephus Sefenhans
Mark Gerrit Stefen Joseph van Pemer
Mark Gerrit Stefen Joseph van Pemer
Application Number:
JP18421293A
Publication Date:
August 19, 2002
Filing Date:
July 26, 1993
Export Citation:
Assignee:
ALCATEL NEAMLOZE VENNOOTSHAP
International Classes:
H03H11/04; H03H11/12; (IPC1-7): H03H11/04; H03H11/12
Domestic Patent References:
| JP1264306A | ||||
| JP2145009A | ||||
| JP6462010A |
Attorney, Agent or Firm:
Takehiko Suzue