US3613067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog-to-digital converter with intermediate frequency signal generated by analog input
Assignee: International Standard Electric Corp
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Filing: 1969-07-15
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Granted: 1971-10-12
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Expires: 1989-07-15
Abstract
Abstract PAM samples are converted to a frequency proportional to the PAM amplitude. The resultant frequencies are applied to 2n resonators each resonant at a different frequency and representing one of 2n code groups. 2n gates, timed by the sampling signal, are each coupled to a voltage node of an associated one of the resonators and logic circuitry coupled to the gates provide the output code group for each sample dependent on the resonator excited. The resonators may be of printed strip line configuration arranged to provide linear or compression coding characteristics. A binary averaging arrangement can be provided to handle situations where the converted frequency excites two or more resonators. A graytype code is employed to reduce coding errors when two or more resonators are excited.
Inventors
- 👤 Heinz Haberle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:42
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
173 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each of said samples; 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the excitation of at least one of said resonators to produce said code groups of said excited resonator; said second means including a source of sampling pulses, a circuit for each of said resonators including rectifier means coupled to its associated one of said resonators, integrator means coupled to said rectifier means, and gate means coupled to said integrator means and said source of sampling pulses, and matrix means coupled to each of said gate means to produce said code group of said excited resonator in parallel form.
Claim 2
Dependent Claim
173 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each of said samples; 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the excitation of at least one of said resonators to produce said code groups of said excited resonator; said second means including a source of sampling pulses, a circuit for each of said resonators including rectifier means coupled to its associated one of said resonators, integrator means coupled to said rectifier means, and gate means coupled to said integrator means and said source of sampling pulses, and matrix means coupled to each of said gate means to produce said code group of said excited resonator in parallel form.
Claim 3
Dependent Claim
24 words
A converter according to claim 1, wherein each of said resonators are of the strip line type configured to provide a linear coding characteristic,
Claim 4
Dependent Claim
24 words
A converter according to claim 1, wherein each of said resonators are of the strip line type configured to provide a compression coding characteristic.
Claim 5
Dependent Claim
20 words
A converter according to claim 1, wherein rectifier means is coupled to a node point on each of said resonators.
Claim 6
Dependent Claim
32 words
A converter according to claim 1, wherein said second means further includes parallel-to-serial converter means coupled to said matrix means to provide said code group of said excited resonator in serial form.
Claim 7
Dependent Claim
17 words
A converter according to claim 1, wherein said converter produces code groups according to a Gray-type code.
Claim 8
Dependent Claim
145 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each said samples; 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the exciTation of at least one of said resonators to produce said code group of said excited resonator; wherein more than one of said resonators is excited by the frequency signal output of said first means; and said second means includes an arrangement to provide at the output thereof the digital average of the code groups represented by said excited resonators.
Claim 9
Dependent Claim
145 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each said samples; 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the exciTation of at least one of said resonators to produce said code group of said excited resonator; wherein more than one of said resonators is excited by the frequency signal output of said first means; and said second means includes an arrangement to provide at the output thereof the digital average of the code groups represented by said excited resonators.
Claim 10
Dependent Claim
214 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each of said samples; p1 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the excitation of at least one of said resonators to produce said code group of said excited resonator; said converter producing code groups according to a Gray-type code; and said second means including a source of sampling pulses, a circuit for each of said resonators including a diode rectifier coupled to a node of its associated one of said resonators, a capacitor coupled between said rectifier and ground, and a gate coupled to the junction of said rectifier and said capacitor and said source of sampling pulses, a diode matrix coupled to each of said gates to produce said code group of said excited resonator in parallel form, and a shift register coupled to said matrix to provide said code group of said excited resonator in serial form.
Claim 11
Dependent Claim
214 words
An analog-to-digital converter comprising: a source of amplitude samples of an analog signal; first means coupled to said source to convert each of said samples to a frequency proportional to the amplitude of each of said samples; p1 2n resonators each coupled to said first means, each of said resonators having a different resonant frequency and representing a different one of 2n code groups, where n is equal to the number of digits forming a code group; and second means coupled to said resonators responsive to the excitation of at least one of said resonators to produce said code group of said excited resonator; said converter producing code groups according to a Gray-type code; and said second means including a source of sampling pulses, a circuit for each of said resonators including a diode rectifier coupled to a node of its associated one of said resonators, a capacitor coupled between said rectifier and ground, and a gate coupled to the junction of said rectifier and said capacitor and said source of sampling pulses, a diode matrix coupled to each of said gates to produce said code group of said excited resonator in parallel form, and a shift register coupled to said matrix to provide said code group of said excited resonator in serial form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |