Higher-order load circuit
View Patent ↗Methods and apparatus, including computer program products, are provided for filtering. In some example embodiments, there is provided an apparatus including a first differential amplifier including a first positive input, a first negative input, and a first output, wherein the first positive input is connected to the first output via at least a first capacitor, and wherein the first negative input is connected to the first output via at least a first resistor; and a second differential amplifier including a second input, a third input, and a second output, wherein the second input is connected to the second output via at least a third resistor, wherein the third input is connected to the second output via at least a second capacitor, and wherein an input is connected to the first positive input and the second input via at least a third capacitor. Related apparatus, systems, methods, and articles are also described.
1. An apparatus comprising:
a first differential amplifier including a first positive input, a first negative input, and a first output, wherein the first positive input is connected to the first output via at least a first capacitor, and wherein the first negative input is connected to the first output via at least a first resistor; and
a second differential amplifier including a second input, a third input, and a second output, wherein the second input is connected to the second output via at least a third resistor, wherein the third input is connected to the second output via at least a second capacitor, and wherein an input is connected to the first positive input and the second input via at least a third capacitor.
2. The apparatus of claim 1 , wherein at least one of the apparatus is coupled to at least one of an N-path filter and a trans-impedance filter.
3. The apparatus of claim 2 , wherein the apparatus is configured to provide a short at one or more frequencies and a high impedance at one or more other frequencies.
4. The apparatus of claim 3 , wherein the one or more frequencies filter out at least an unwanted signal.
5. The apparatus of claim 1 , wherein the second input has a positive polarity and the third input has a negative polarity.
6. The apparatus of claim 1 , wherein the second input has a negative polarity, and the third input has a positive polarity.
7. The apparatus of claim 1 , wherein the first negative input is connected to the first output via at least the first resistor and to a ground via a second resistor.
8. The apparatus of claim 1 , wherein the input is connected to the first positive input and the second input via the third capacitor and to the second output via a fifth resistor.
9. The apparatus of claim 1 , wherein the third input is connected to the second output via the second capacitor and to the ground via a fourth resistor.
10. A method comprising:
receiving, at an input of a load circuit, a signal, wherein the load circuit comprises a first differential amplifier including a first positive input, a first negative input, and a first output, wherein the first positive input is connected to the first output via at least a first capacitor, and wherein the first negative input is connected to the first output via at least a first resistor, wherein the load circuit further comprises a second differential amplifier including a second input, a third input, and a second output, wherein the second input is connected to the second output via at least a third resistor, wherein the third input is connected to the second output via at least a second capacitor, and wherein the input is connected to the first positive input and the second input via at least a third capacitor; and
sinking, by the load circuit, the received signal.
11. The method of claim 10 , wherein at least one of the load circuit is coupled to at least one of an N-path filter and a trans-impedance filter.
12. The method of claim 11 , wherein the load circuit is configured to provide the sinking by at least providing a short at one or more frequencies, wherein the load circuit further provides a high impedance at one or more other frequencies.
13. The method of claim 12 , wherein the one or more frequencies filter out at least an unwanted signal.
14. The method of claim 11 , wherein the second input has a positive polarity and the third input has a negative polarity.
15. The method of claim 11 , wherein the second input has a negative polarity, and the third input has a positive polarity.
16. The method of claim 11 , wherein the first negative input is connected to the first output via at least the first resistor and to a ground via a second resistor.
17. The method of claim 11 , wherein the input is connected to the first positive input and the second input via the third capacitor and to the second output via a fifth resistor.
18. The method of claim 11 , wherein the third input is connected to the second output via the second capacitor and to the ground via a fourth resistor.
19. A non-transitory computer-readable medium including code which when executed by at least one processor circuitry causes operations comprising:
receiving, at an input of a load circuit, a signal, wherein the load circuit comprises a first differential amplifier including a first positive input, a first negative input, and a first output, wherein the first positive input is connected to the first output via at least a first capacitor, and wherein the first negative input is connected to the first output via at least a first resistor, wherein the load circuit further comprises a second differential amplifier including a second input, a third input, and a second output, wherein the second input is connected to the second output via at least a third resistor, wherein the third input is connected to the second output via at least a second capacitor, and wherein the input is connected to the first positive input and the second input via at least a third capacitor; and
sinking, by the load circuit, the received signal.