Gain boosting for tuned differential LC circuits
First Claim
1. A gain boost amplifier circuit, comprising:
- at least one input port for receiving communication signals;
at least one output port for providing amplified communication signals;
amplification circuitry coupled between the input port and the output port, the amplification circuitry for amplifying the received communication signals by a gain value;
at least one output resonant tank circuit coupled to the output port that is tuned to provide a first impedance level at a desired operating frequency of the amplification circuitry; and
an adjustable negative transconductance stage coupled between the output resonant tank circuit and the amplification circuitry for effectively generating an adjustable negative transconductance value to reduce any resistive losses generated by the output resonant tank circuit, thereby increasing the gain value of the amplification circuitry.
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Accused Products
Abstract
A gain boost circuit and methodology are described for providing improved gain boosting with tuned amplifier circuits, such as differential low noise amplifier circuits having output resonant tank circuits. By selectively controlling the current source for a negative transconductance stage coupled between the differential amplifier output and the output resonant tank circuits, the amplifier gain may be adjusted to compensate for temperature variations. In addition, the amplifier gain boost may be selectively added, removed or even incrementally adjusted by using a current source control circuit in the negative transconductance stage to adjust the negative transconductance value generated by the negative transconductance stage.
37 Citations
20 Claims
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1. A gain boost amplifier circuit, comprising:
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at least one input port for receiving communication signals;
at least one output port for providing amplified communication signals;
amplification circuitry coupled between the input port and the output port, the amplification circuitry for amplifying the received communication signals by a gain value;
at least one output resonant tank circuit coupled to the output port that is tuned to provide a first impedance level at a desired operating frequency of the amplification circuitry; and
an adjustable negative transconductance stage coupled between the output resonant tank circuit and the amplification circuitry for effectively generating an adjustable negative transconductance value to reduce any resistive losses generated by the output resonant tank circuit, thereby increasing the gain value of the amplification circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13)
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- 11. A method for boosting a gain level for a low noise amplifier comprising an amplifier circuit and an output tank circuit, comprising selectively coupling an adjustable negative transconductance circuit between the amplifier circuit and the output tank circuit to effectively generate an adjustable negative transconductance value to compensate for any losses generated by the output tank circuit.
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18. A receiver comprising:
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a low noise amplifier coupled to receive wireless communication signals from an antenna for amplifying said signals by a gain factor, an output tank circuit coupled to the low noise amplifier and tuned to increase the gain of the low noise amplifier, a negative transconductance circuit, and a means for selectively coupling the negative transconductance circuit to the output tank circuit in response to a power up signal. - View Dependent Claims (19, 20)
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Specification