Burst-mode receiver
Provided is a burst-mode receiver configured to receive an optical signal having a preamble and a data payload, the burst-mode receiver including a first bias resistor coupled between a first voltage supply and a photosensor, a first capacitor coupled between the photosensor and an amplifier, a first common-mode resistor configured to supply a voltage of a common-mode voltage supply to the amplifier, a first bypass switch configured to couple the first capacitor to the common-mode voltage supply while bypassing the first common-mode resistor, and a first data switch configured to couple the first capacitor to the amplifier, and to couple the first capacitor to the common-mode voltage supply through the first common-mode resistor.
1. A burst-mode receiver configured to receive an optical signal having a preamble and a data payload, the burst-mode receiver comprising:
a first bias resistor coupled between a first voltage supply and a photosensor;
a first capacitor coupled between the photosensor and an amplifier;
a first common-mode resistor configured to supply a voltage of a common-mode voltage supply to the amplifier;
a first bypass switch configured to couple the first capacitor to the common-mode voltage supply while bypassing the first common-mode resistor; and
a first data switch configured to couple the first capacitor to the amplifier, and to couple the first capacitor to the common-mode voltage supply through the first common-mode resistor.
2. The burst-mode receiver of claim 1 , wherein the photosensor is configured to receive the optical signal and to convert the optical signal to a current signal.
3. The burst-mode receiver of claim 2 , wherein, preceding the preamble of the received optical signal, the first bypass switch is configured to couple the first capacitor to the common-mode voltage supply while bypassing the first common-mode resistor, and to couple the first capacitor to the amplifier through the first common-mode resistor.
4. The burst-mode receiver of claim 2 , wherein, preceding the preamble of the received optical signal, the first data switch is configured to deactive to break a direct connection between the first capacitor and the common-mode voltage supply.
5. The burst-mode receiver of claim 2 , wherein, preceding the data payload of the received optical signal, the first data switch is configured to couple the first capacitor to the amplifier through a path not comprising the first common-mode resistor, and to the common-mode voltage supply through the first common-mode resistor.
6. The burst-mode receiver of claim 2 , wherein, preceding the data payload of the received optical signal, the first bypass switch is configured to deactivate to break a direct connection between the first capacitor and the common-mode voltage supply.
7. The burst-mode receiver of claim 1 , further comprising a controller configured to control activated and deactivated states of the first bypass and data switches.
8. The burst-mode receiver of claim 1 , wherein the preamble precedes the data payload in time, and comprises a balanced plurality of binary high and binary low bits.
9. The burst-mode receiver of claim 1 , wherein the amplifier is configured to generate an output voltage proportional to a current of the photosensor.
10. The burst-mode receiver of claim 1 , wherein the first bias resistor is configured to convert a current from the photosensor to a differential voltage signal.
11. The burst-mode receiver of claim 1 , further comprising:
a second bias resistor coupled between a second voltage supply and the photosensor;
a second capacitor coupled between the photosensor and the amplifier;
a second common-mode resistor configured to supply the voltage of the common-mode voltage supply to the amplifier;
a second bypass switch configured to couple the second capacitor to the common-mode voltage supply while bypassing the common-mode resistor; and
a second data switch configured to couple the capacitor to the amplifier, and to couple the capacitor to the common-mode voltage supply through the common-mode resistor.
12. The burst-mode receiver of claim 11 , wherein the first bias resistor is coupled between a cathode electrode of the photosensor and the first voltage supply, and the second bias resistor is coupled between an anode electrode of the photosensor and the second voltage supply.
13. The burst-mode receiver of claim 11 , wherein the first common-mode resistor couples a first input of the amplifier to the common-mode voltage supply, and the second common-mode resistor couples a second input of the amplifier to the common-mode voltage supply.
14. The burst-mode receiver of claim 11 , wherein the first capacitor is coupled between a cathode of the photosensor and a first input of the amplifier, the second capacitor is coupled between an anode of the photosensor and a second input of the amplifier.
15. The burst-mode receiver of claim 14 , wherein the first data switch is coupled between the first capacitor and the first input of the amplifier, the second data switch is coupled between the second capacitor and the second input of the amplifier, and the first and second data switches are configured to be concurrently activated or concurrently deactivated.
16. The burst-mode receiver of claim 11 , wherein the first bypass switch is coupled between the first capacitor and the common-mode voltage supply, the second bypass switch is coupled between the second capacitor and the common-mode voltage supply, and the first and second bypass switches are configured to be concurrently activated or concurrently deactivated.
17. A burst-mode receiver configured to receive an optical signal having a preamble and a data payload, the burst-mode receiver comprising:
a bias resistor coupled between a first voltage supply and a photosensor;
a capacitor coupled between the photosensor and an amplifier;
a common-mode resistor configured to supply a voltage of a common-mode voltage supply to the amplifier;
a data switch coupled between the capacitor and the amplifier; and
a bypass switch coupled between the capacitor and the common-mode voltage supply; and
a controller configured to activate the bypass switch, preceding the preamble, to couple the capacitor to the common-mode voltage supply while bypassing the common-mode resistor, the controller being further configured to activate the data switch, preceding the data payload, to couple the capacitor to the amplifier, and to couple the capacitor to the common-mode voltage supply through the common-mode resistor.
18. The burst-mode receiver of claim 17 ,
wherein the controller is further configured to deactivate the data switch, preceding the preamble, to bypass the common-mode resistor to couple the capacitor to the amplifier, and
wherein the controller is further configured to deactivate the bypass switch, preceding the data payload, to break a direct connection between the capacitor and the common-mode voltage supply.
19. The burst-mode receiver of claim 17 , wherein the amplifier is configured to generate an output voltage signal based on the payload data when the data switch is activated.