Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
1999-09-03
2001-12-04
Lam, Tuan T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S558000
Reexamination Certificate
active
06326838
ABSTRACT:
BACKGROUND OF THE INVENTION
Especially, this invention concerns control method and magnetism disk system of filter property of analogue filters on the control method of analogue filters detailed description of the invention technology field which the invention belongs to.
The conventional technology is explained using
FIG. 2
conventional technology.
FIG. 2
showed analogue filters blocks, and it is composed of analogue filters of
10
, transconductance control circuit of
19
, digital to analog conversion vessel
205
~
208
, registers of
12
. And, analogue filters of
10
consist of transconductance amplifier
50
~
53
,
54
,
56
capacity. Transconductance amplifier of
19
is composed of replica transconductance amplifier of
21
, resistance of
22
, reference voltage source
20
,
23
, differential amplifier of
24
, voltage-current translate circuit of
29
. In the conventional filter control system of transconductance amplifier
50
~
53
which constitutes analogue filters of
10
by using digital analog converter circuit
205
~
208
in proportion to the value that it converted the reference voltage which was created in transconductance control circuit of
19
into the current at voltage-current translate circuit
30
~
33
and set in registers of
12
for this current. The lance conductance has been controlled. It seems to describe analogue filters control method at U.S. Pat. No. 5,572,163.
SUMMARY OF THE INVENTION
Transconductance amplifier which constituted analogue filters of
10
in the technology the superscription convention was made by the BiCMOS process the problem in which the invention intends to reach solution. The graph of the relation between control current and transconductance is shown in FIG.
3
. The case in which the graph in composing the transconductance amplifier of the BiCMOS process was composed of
60
and CMOS process is shown in
61
. The relation between transconductance and control current was linear, when the transconductance amplifier was composed of the BiCMOS. The relation between transconductance and control current becomes the nonlinearity like graphs of
61
of
FIG. 3
, when the transconductance amplifier was composed of CMOS. Therefore, it is difficult that it must put the ratio of the transconductance together so that the filter property may become fixed at digital analog converter circuit
205
~
208
of figure of
2
, and that ratio accuracy of each transconductance takes it, and there is a problem that the filter property deteriorates. And, in case of the composition of
FIG. 2
, the digital analog converter circuit must be prepared in proportion to the type of transconductance value of the transconductance amplifier which constitutes analogue filters of
10
, and there is a problem that circuit scale and consumption current increase.
As a means for solving the superscription problem, analogue filters control method by this invention is shown in figure of
1
means for solving the problem. Analogue filters control method shown for this invention shown in figure of
1
is composed of analogue filters of
10
, transconductance control circuit of
19
, selectors of
40
,
35
~
38
capacity, voltage-current translate circuit
30
~
33
, clocks of
41
. Analogue filters of
10
are composed of transconductance amplifier
50
~
53
,
54
,
56
capacity. Transconductance control circuit of
19
is composed of replica transconductance amplifier of
21
and resistance of
22
, reference voltage source
20
,
25
~
28
, selectors of
44
, differential amplifier of
24
, voltage-current translate circuit of
29
with characteristics equal to transconductance amplifier which constitutes analogue filters of
10
. Switch of
42
of selectors of
44
is connectable for reference voltage source
25
~
28
, and the every constant period is made to connect it using clocks of
41
at reference voltage source
25
~
28
. Switch of
43
of selectors of
40
is connectable for the
35
~
38
capacity, and the every constant period is made to connect it using clocks of
41
at the
35
~
38
capacity. It is possible that by choosing such composition, reference voltage
25
~
28
are met in the every constant period, that the transconductance control circuit can output the transconductance control signal and that it respectively retains these transconductance control signal at the
35
~
38
capacity. It is possible to control the transconductance of the each transconductance amplifier high-precise by this. And, it is possible to reduce the digital analog converter circuit by taking the composition of this invention, and it becomes possible that circuit scale and power consumption are reduced.
REFERENCES:
patent: 5187445 (1993-02-01), Jackson
patent: 5534819 (1996-07-01), Gunter et al.
patent: 5572163 (1996-11-01), Kimura et al.
patent: 5614860 (1997-03-01), Osaki et al.
patent: 5912583 (1999-06-01), Pierson et al.
Kato Takatoshi
Kimura Hiroshi
Mita Seiichi
Nara Takashi
Nishiya Takushi
Hitachi , Ltd.
Lam Tuan T.
Mattingly Stanger & Malur, P.C.
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