Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1980-05-15
1982-10-26
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
328151, H03H 1900, H03K 5153
Patent
active
043564640
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filter for electric oscillations consisting of switches, capacitors and amplifiers, whereby at least one switch is designed in the manner of voltage reversal switches such that the voltage at the switch terminals, subsequent to actuation of the switch, is equally great in amount, but oppositely directed in relation to the voltage prior to actuation of the switch.
Switch filters of the above cited type have already become known per se. A special type of such switch filters are the so-called resonant transfer filters which are e.g. described in the journal "AEU," Vol. 24 (1970), Pages 506 through 512, as well as Vol. 25 (1971), Pages 295 through 303, and, above all, in the book "Network and Switching Theory" (edited by G. Biorci) and described therein under the sub-title "Theory of Resonant-Transfer-Circuits," pages 382 through 446, Academic Press, New York 1968. The practical realization of such filters, however, is dependent, to a not inconsiderable degree, upon the available technology, particularly if it is important to manufacture such filters with properties capable of good reproduction on a larger scale in terms of production engineering.
The object underlying the invention consists in disclosing filter circuits of this type in which comparatively simple electronic components can be utilized, and simultaneously the individual filter circuit, already in its theoretical design, is not subject to any type of restriction whatsoever regarding the operational behavior or the position of the attenuation poles.
In accordance with the invention, this object is achieved for the filters cited in the introduction by virtue of the fact that the voltage connected to the switch terminals, in a first clock pulse phase, is intermediately stored on a capacitor via a first amplifier and, in a second clock pulse phase via a second amplifier, the latter voltage is again impressed on the switch terminals in inverted form.
An additional advantageous solution can be seen in accordance with the invention in that, in a first clock pulse phase, the switch terminals are brought to the same potential, and the charge thus flowing via these terminals is intermediately stored in a capacitor, and that the capacitor is subsequently discharged in a second clock pulse phase, and that this charge is conducted in the same direction as in the first clock pulse phase via the switch terminals. Advantageous embodiments are also disclosed in the sub-claims.
On the basis of sample embodiments, the invention shall be further explained below.
IN THE DRAWING
FIG. 1 illustrates a first possibility for realizing a voltage reversal switch;
FIG. 2 illustrates an additional possibility for realizing a voltage reversal switch with only one amplifier element;
FIG. 3 illustrates the electric equivalent circuit diagram of a voltage reversal switch in the form of a switching symbol which is utilized in the following;
FIG. 4 illustrates a possible time-plan for the necessary clock pulse phases for circuits according to FIGS. 1 and 2 and circuits for Figures yet to follow;
FIG. 5 illustrates a possible realization form for electronic switches such as are utilized in the invention;
FIG. 6 illustrates a possibility for simulation of an inductance pursuant to utilization of a capacitor and electronic switches;
FIG. 7 illustrates a possibility for simulating an ohmic resistance;
FIG. 8 illustrates a possibility for simulating a signal source with an inner resistance;
FIG. 9A illustrates the equivalent circuit for a high pass filter;
FIG. 9B illustrates a schematic circuit diagram for the high pass filter of FIG. 9A;
FIG. 10 illustrates a circuit section with the aid of which circuits of the type of FIG. 9 can again be connected to reference potential;
FIG. 11 illustrates a circuit possibility for simulating a unit element;
FIG. 12 illustrates the electric equivalent circuit diagram pertaining to the circuit of FIG. 11;
FIG. 13 illustrates a circuit possibility for simulating a gyro unit element;
FIG. 14 illustrates the electric equiv
REFERENCES:
Fettweis-"Pulse Impedances and Pulse Impedance Matrices," AEU Band 24, 1970, Heft 11; pp. 506-512.
Fettweis-"Realization of General Network Functions," AEU Band 25, 1971, Heft 6; pp. 295-203.
Biorci-"Network and Switching Theory," Academic Press, New York and London, 1968; pp. 382-446.
Fettweis-"Basic Principles of Switched Capacitor Filters Using Voltage Inverter Switches", AEU, vol. 33, No. 1, Jan. 1979; pp. 13-19.
Fettweis-"Switched Capacitor Filters Using Voltage Inverter Switches," AEU, vol. 33, No. 3, Mar. 1979; pp. 107-114.
Weinrichter-"Kondensator-Kommutator-Netzwerke," AEU, vol. 26, No. 7/8, Jul./Aug. 1972; pp. 293-305.
Fettweis-"On the Theory of Periodically Reverse-Swithed Capacitor Networks," AEU, vol. 24, No. 12, Dec. 1960, pp. 539-544.
Temes-"The Derivation of Switched Capacitor Filters from Active RE Prototypes," Electronics Letters, vol. 14, No. 12, Jun. 8, 1978; pp. 361-362.
Temes-"An Improved Switched-Capacitor Integrator," Electronics Letters, vol. 14, No. 9, 27 Apr. 1978; pp. 287-288.
Nussbaum Marvin L.
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