Network having a resistance the temperature coefficient of which is variable at will
阅读：518发布：2022-10-18
专利汇可以提供Network having a resistance the temperature coefficient of which is variable at will专利检索，专利查询，专利分析的服务。并且A temperature compensation network having a resistance that exhibits a temperature coefficient that is adjustable substantially independently of the voltage applied to the network. The network includes a resistive voltage divider connected in parallel with the emitter-collector path of a transistor. The base of the transistor is connected to a tapping on the voltage divider. A zener diode having a zero temperature coefficient relative to the transistor temperature coefficient is connected to the voltage divider, whereby the network exhibits a net negative temperature coefficient of resistance.，下面是Network having a resistance the temperature coefficient of which is variable at will专利的具体信息内容。
1. A temperature dependent network having a resistance with a temperature coefficient that is variable at will comprising, a transistor, a plurality of resistance elements connected to form a resistive voltage divider, means connecting the resistive voltage divider in parallel with the emitter-collector path of the transistor, means connecting the base of the transistor to a tapping on the voltage divider so that the resistance value of the part of the voltage divider connected between the emitter and the base of the transistor is smaller than the value of the baseemitter input impedance of the transistor, the overall resistance value of the voltage divider being chosen so that the current through the whole of the voltage divider is smaller than the collector current of the transistor, an element having a temperature coefficient that is substantially equal to zero relative to the transistor temperature coefficient and including at least one Zener diode, and means connecting said element in the voltage divider so that the temperature coefficient of the network can be chosen substantially independently of the reverse collector voltage set up across the network.
2. A network as claimed in claim 1, characterized in that the element includes at least one diode connected in series with the Zener diode in the forward direction so as to substantially compensate for the temperature coefficient of the Zener diode.
3. A network as claimed in claim 1, characterized in that the element including the Zener diode is connected to the emitter of the transistor through a resistor.
4. A network as claimed in claim 4, characterized in that the collector circuit of the transistor includes a further resistor.
5. A network as claimed in claim 1 wherein the last-named connecting means is arranged to connect a part of the resistive voltage divider in parallel with said zero temperature coefficient element, and means connecting a tapping on said parallel part of the voltage divider to the base of the transistor.
6. A temperature-sensitive network with a temperature coefficient of resistance that is adjustable substantially independently of the voltage applied to the network comprising, a pair of input terminals, a transistor with a given temperature coefficient, a constant voltage element with a temperature coefficient that is negligible relative to said given temperature coefficient of the transistor, a resistive voltage divider, means connecting the constant voltage element in series with the voltage divider across the network input terminals, and means connecting the emitter-collector path of the transistor in parallel with the resistive voltage divider and the base electrode to a tapping on the voltage divider such that the resistance of the part of the voltage divider between the base and emitter of the transistor is smaller than the transistor base-emitter input impedance.
7. A network as claimed in claim 6 wherein said constant voltage element comprises a Zener diode in series with a diode of approximately equal and opposite temperature coefficient.
8. A network as claimed in claim 7 wherein said Zener diode and diode are connected in series in that part of the voltage divider connected between the base and collector of the transistor.
9. A network as claimed in claim 6 wherein said constant voltage element comprises a Zener diode, said network further comprising a second resistive voltage divider connected in parallel with the Zener diode, and wherein the base electrode of the transistor is directly connected to a tapping on the second voltage divider.
10. A network as claimed in claim 9 wherein the first voltage divider comprises first and second resistors, and wherein said first resistor, said Zener diode and said second resistor are serially connected in the order named across the network input terminals.
11. A network as claimed in claim 6 Further comprising a second resistive voltage divider connected in parallel with said constant voltage element, and means connecting a tapping on said second voltage divider to the base of the transistor.
12. A network as claimed in claim 13 wherein said constant voltage element comprises a Zener diode.
13. A temperature sensitive network with a temperature coefficient of resistance that is adjustable substantially independently of the voltage applied to the network comprising, a pair of input terminals, a transistor with a given temperature coefficient, a zener diode with a temperature coefficient that is negligible relative to the transistor temperature coefficient, a first resistive voltage divider, a second resistive voltage divider connected in parallel with the zener diode and across the input terminals, means connecting the first voltage divider to a tapping on the second voltage divider, and means including a part of said second voltage divider for connecting the emitter-collector path of the transistor in parallel with the first resistive voltage divider and the base electrode to a tapping thereon such that the resistance of the part of the first voltage divider between the base and emitter of the transistor is smaller than the transistor base-emitter input impedance.
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