EP0327078A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Trimming resistor network
Assignee: Toshiba Corp
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Filing: 1989-02-01
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Granted: —
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Expires: 2009-02-01
Abstract
Abstract A trimming resistor network includes first and second external connection terminals (T1, T2), a first resistor (11) having two ends acting as first and second connection terminals (11a, 11b), a first coupling body (13) for connecting the first external connection terminal (T1) to the first connection terminal (11a) via series-connected resistors (R2, R4), a second coupling body (14) for connecting the second external connection terminal (T2) to the second connection terminal (11b) directly or via series-connected resistors, and parallel trimming resistors (R3) having two ends respectively connected to the first and second coupling bodies (13 and 14). The combined resistance between the first and second external connection terminals (T1 and T2) is increased by substantially a preset amount each time one of the parallel trimming resistors (R3) is cut off.
Inventors
- 👤 Kaoru C/O Patent Division Imamura
- 👤 Wataru C/O Patent Division Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:18
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/22; H01C17/23
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A trimming resistor network comprising: a pre-stage 4-terminals circuit block (A) having first (T1) and second (T2) input terminals; a plurality of succeeding-stage 4-terminals circuit blocks (Bl to Bi) cascade-connected with said pre-stage 4-terminals circuit block (A), an internal circuit construction (for example, in Fig. 11F) of at least part (for example, B1) of said plurality of succeeding-stage 4-terminal circuit blocks (B1 to B1) being different from an internal circuit construction (for example, in Fig. 11A) of said pre-stage 4-terminal circuit block (A), and the final stage (B1) of said succeeding-stage 4-terminal circuit block (Bl to Bi) having first (11a) and second (11b) output terminals; and a load circuit (ZL) terminating said first (11a) and second (11b) output terminals, wherein the internal circuit construction of at least part (for example, B1) of said plurality of succeeding-stage 4-terminal circuit blocks (Bl to Bi) includes a trimming resistor element (R3) which is cut off by a predetermined trimming operation.
Claim 2
Dependent Claim
157 words
A trimming resistor network comprising: a pre-stage 4-terminals circuit block (A) having first (T1) and second (T2) input terminals; a plurality of succeeding-stage 4-terminals circuit blocks (Bl to Bi) cascade-connected with said pre-stage 4-terminals circuit block (A), an internal circuit construction (for example, in Fig. 11F) of at least part (for example, B1) of said plurality of succeeding-stage 4-terminal circuit blocks (B1 to B1) being different from an internal circuit construction (for example, in Fig. 11A) of said pre-stage 4-terminal circuit block (A), and the final stage (B1) of said succeeding-stage 4-terminal circuit block (Bl to Bi) having first (11a) and second (11b) output terminals; and a load circuit (ZL) terminating said first (11a) and second (11b) output terminals, wherein the internal circuit construction of at least part (for example, B1) of said plurality of succeeding-stage 4-terminal circuit blocks (Bl to Bi) includes a trimming resistor element (R3) which is cut off by a predetermined trimming operation.
Claim 3
Dependent Claim
39 words
A resistor network according to claim 1, characterized in that said pre-stage 4-terminal circuit block (A) includes a resistance component (Z1, Z2, or Z3) connected in series with at least one of said first (T1) and second (T2) terminals.
Claim 4
Dependent Claim
30 words
A resistor network according to claim 1, characterized in that said pre-stage 4-terminal circuit block (A) includes a resistance component (Z4) connected between said first (T1) and second (T2) terminals.
Claim 5
Dependent Claim
93 words
A resistor network according to any one of claims 1 to 3, characterized in that the internal circuit construction of at least part (for example, B1) of said plurality of succeeding-stage 4-terminal circuit blocks (Bl to Bi) includes a serial resistance component (for example, Z11) serially connected in a first circuit connecting said first input terminal (T1) to said first output terminal (11a) and a parallel resistance component (for example, Z10) connected between said first circuit and a second circuit which connects said second input terminals (T2) to said second output terminals (11b).
Claim 6
Dependent Claim
105 words
A resistor network according to any one of claims 1 to 3, characterized in that the internal circuit construction of at least part (for example, B1) of said plurality of succeeding-stage 4-terminals circuit blocks (Bl to Bi) includes a first serial resistance component (for example, Z7) serially connected in a first circuit connecting said first input terminals (T1) to said first output terminals (11a); a second serial resistance component (for example, Z8) serially connected in a second circuit connecting said second input terminals (T2) to said second output terminal (11b); and a parallel resistance component (for example, Z9) connected between said first and second circuits.
Claim 7
Dependent Claim
52 words
A resistor network according to any one of claims 1 to 5, characterized in that the internal circuits of said plurality of succeeding-stage 4-termianls circuit blocks (Bl to Bi) each include a trimming resistor element (R3) which is formed in an integrated circuit and is cut off by a predetermined trimming operation.
Claim 8
Dependent Claim
51 words
A resistor network according to claim 6, characterized in that at least part of said trimming resistor element (R3) is formed of one selected from a group consisting of a polysilicon film doped with impurity, nichrome-series alloy film, tantalum-series metal film, polyimide organic film, acrylonitrile organic film, and ruthenium-series oxide film.
References Cited (Backward Citations)
No citation records indexed.
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