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US 4,792,782 AGranted
Apparatus and method for providing improved resistive ratio stability of a resistive divider network
OwnerRobert W. Hammondinventor
Life of this patent
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Abstract
A resistor divider network is disclosed having two or more thin or thick film resistive elements deposited on a substrate. Each of the resistive elements is divided into a number of resistive subelements which are interleaved so as to improve the temperature coefficient of ratio (TCR tracking) and improve the thermal coupling which greatly improves the ratio constancy over a wide range of input voltage. There are an odd total number of resistive subelements, the subelements of each main element having equal resistances.
Claims19
A resistive network, comprising:
- a substrate;
- a first resistive element disposed on said substrate having two interconnected portions substantially equal in power dissipation in response to an applied voltage, one of said portions connectible to an input terminal and the other of said portions connectible to an output terminal;
- a second resistive element disposed on said substrate substantially equidistant between said one and the other portions of said first resistive element, said second resistive element having one end connectible to a ground terminal and a second end connectible to said output terminal.
A resistive network comprising:
- a substrate;
- a first resistive element supported on said substrate and having a sequence of interconnectible resistive first subelements having substantially equal power dissipation in response to an applied voltage, said first subelements spaced apart across said substrate, a first of said sequence of first subelements connectible to an input terminal and a last of said sequence of first subelements connectible to an output terminal;
- and
- a second resistive element supported on said substrate having at least one resistive second subelement disposed on said substrate substantially equidistant between a pair of said resistive first subelements, said at least one resistive second subelement of said second resistive element having a portion connectible to said last of said sequence of first subelements of said first resistive element and a portion connectible to a ground terminal.
1 more element
A resistive network comprising:
- a substrate;
- a first resistive element deposited in a serpentine pattern on said substrate and including a sequence of interconnectible resistive first subelements substantially equal in power dissipation in response to an applied voltage, said resistive first subelements spaced apart across said substrate, the first of said sequence of resistive first subelements connectible to an input terminal and the last of said sequence of resistive first subelements connectible to an output terminal;
- and
- a second resistive element deposited in a serpentine pattern on said substrate having a sequence of resistive second subelements spaced across said substrate and interleaved with the resistive first subelements of said first resistive element, the first of said sequence of resistive second subelements connectible to a ground and the last of said sequence of resistive second subelements connectible to said output terminal.
1 more element
A method of making a resistive network comprising the steps of:
- (a) depositing a resistive material on the substrate;
- (b) removing a first portion of the resistive material to define a first resistive element having first and second subelements;
- (c) removing a second portion of the resistive material to define a second resistive element having a third subelement substantially equidistant between said first and second subelements of said first resistive member;
- (d) laser trimming said first and second subelements of said first resistive member to make the resistances of said first and second subelements substantially equal.
1 more element
Dependencies are inferred from the claim text.