Patent US1769215A successfully refreshed from Google Patents.
Patent US3849741A successfully refreshed from Google Patents.
US3849741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast rise time oscillator
Assignee: Texas Instruments Inc
•
Filing: 1970-09-25
•
Granted: 1974-11-19
•
Expires: 1990-09-25
Abstract
Abstract A circuit and method of operation thereof are disclosed for initiating oscillations in an oscillator at a signal level greater than the signal level of undesired interference which decreases the rise time of the oscillator. The oscillator circuit includes a transistor which initially has one of its junctions in a forward biased condition, preferably the collector-base junction, and then causing the transistor to operate in a normal transistor mode which reverse biases the collector-base junction and produces an internal transient which occurs in the circuit by the quick turn-off time of the junction. The internal transient injected into the feedback loop of the oscillator causes a rapid build up of oscillations and thus a reduced rise time of oscillation to occur in the oscillator circuit.
Inventors
- 👤 L Groom
- 👤 L Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:04
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/80; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a junction, with a tuned circuit electrically connected across said junction, comprising the steps of: forward biasing said junction, and then reverse biasing said junction to cause a rapid change in current in said junction thereby producing an internal transient in said tuned circuit which produces a rapid build up of oscillation.
Claim 2
Independent Claim
65 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a junction, with a tuned circuit electrically connected across said junction, comprising the steps of: forward biasing said junction, and then reverse biasing said junction to cause a rapid change in current in said junction thereby producing an internal transient in said tuned circuit which produces a rapid build up of oscillation.
Claim 3
Dependent Claim
15 words
The method of claim 1 whErein said junction is the base-collector junction of said transistor.
Claim 4
Dependent Claim
28 words
The method of claim 1 further including the step of introducing in said tuned circuit an external transient to further enhance build up of oscillations in said oscillator.
Claim 5
Independent Claim
76 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a junction, with a tuned circuit electrically connected across said junction, comprising the steps of: forward biasing said junction to store energy within said tuned circuit prior to the initiation of oscillations, and then reverse biasing said junction thereby momentarily providing a reverse current through said junction producing an internal transient in said tuned circuit which produces a rapid build up of oscillation.
Claim 6
Independent Claim
76 words
A method of rapidly initiating oscillations in an oscillator, including a transistor having a junction, with a tuned circuit electrically connected across said junction, comprising the steps of: forward biasing said junction to store energy within said tuned circuit prior to the initiation of oscillations, and then reverse biasing said junction thereby momentarily providing a reverse current through said junction producing an internal transient in said tuned circuit which produces a rapid build up of oscillation.
Claim 7
Dependent Claim
23 words
The method of claim 4 including the step of applying an external transient into the tuned circuit substantially simultaneously with the internal transient.
Claim 8
Dependent Claim
84 words
An oscillator for producing an output having first rise time oscillations, comprising: a. an oscillator transistor having a junction therein, b. a tuned circuit electrically connected across said junction, c. means associated with said transistor for forward biasing said junction to effect energy storage in said tuned circuit prior to the initiation of oscillations, and d. means for reverse biasing said junction to produce a momentary reverse current that causes an internal transient in said tuned circuit immediately prior to the initiation of oscillations.
Claim 9
Dependent Claim
84 words
An oscillator for producing an output having first rise time oscillations, comprising: a. an oscillator transistor having a junction therein, b. a tuned circuit electrically connected across said junction, c. means associated with said transistor for forward biasing said junction to effect energy storage in said tuned circuit prior to the initiation of oscillations, and d. means for reverse biasing said junction to produce a momentary reverse current that causes an internal transient in said tuned circuit immediately prior to the initiation of oscillations.
Claim 10
Dependent Claim
16 words
An oscillator according to claim 6 wherein said junction is the base-collector junction of said transistor.
Claim 11
Dependent Claim
86 words
An oscillator for producing an output having fast rise time oscillations, comprising: a. an oscillator transistor, b. a tuned circuit electrically connected across the base-collector junction of said transistor, c. network biasing means to effect a forward bias current through said base-collector junction causing energy storage in said tuned circuit, and d. means coupled to said network biasing means for reverse biasing said junction to produce a momentary reverse current that causes an internal transient in said tuned circuit immediately prior to the initiation of oscillations.
Claim 12
Dependent Claim
86 words
An oscillator for producing an output having fast rise time oscillations, comprising: a. an oscillator transistor, b. a tuned circuit electrically connected across the base-collector junction of said transistor, c. network biasing means to effect a forward bias current through said base-collector junction causing energy storage in said tuned circuit, and d. means coupled to said network biasing means for reverse biasing said junction to produce a momentary reverse current that causes an internal transient in said tuned circuit immediately prior to the initiation of oscillations.
Claim 13
Dependent Claim
23 words
An oscillator according to claim 8 further including means for applying an external transient essentially simultaneously with the application of said internal transient.
Claim 14
Dependent Claim
33 words
An oscillator according to claim 9 wherein said tuned circuit includes at least one inductor in the series path of the base-collector junction and said means for applying includes at least one inductor.
References Cited (Backward Citations)
US3215947A
Cited
US3503008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |