1. A waterproof plug for a waterproof connector, comprising;
a body portion, which has a substantially cylindrical shape, and has a first end and a second end which is opposite side of the first end; and
an enlarged portion, which is formed on the first end of the body portion in coaxial relation thereto,
wherein a slanting face is formed on an outer face of the enlarged portion so that the enlarged portion decreases in a diameter from a side of the second end toward a side of the first end.
2. A waterproof plug for a waterproof connector including a housing and an elastic plug, the housing having a receiving chamber for receiving a terminal connected to a cable, an opening, a communication portion through which the opening and the receiving chamber communicate with each other, and a slanting portion formed between the communication portion and the receiving chamber, and the elastic plug having a through hole for being passed through the cable and the elastic plug being press-fitted in the communication portion, the waterproof plug, comprising:
a body portion, which has a substantially cylindrical shape, and has a first end and a second end which is opposite side of the first end; and
an enlarged portion, which is formed on the first end of the body portion in coaxial relation thereto,
wherein a slanting face is formed on an outer face of the enlarged portion so as to correspond to the slanting portion so that the enlarged portion decreases in a diameter from a side of the second end toward a side of the first end;
wherein instead of the cable, the body portion is fitted in the through hole of the elastic plug; and
wherein the slanting face of the enlarged portion is bring into contact with the slanting portion of the housing when the elastic plug is press-fitted in the communication portion of the housing.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A random signal generator circuit comprising:
a thermal noise generator circuit;
a self-biased inverter circuit having an input coupled to the thermal noise generator circuit and to a feedback resistor coupled to an output of the self-biased inverter circuit, the self-biased inverter circuit configured to produce a sensed noise signal at the output responsive to thermal noise generated by the thermal noise generator circuit; and
an amplifier circuit coupled to the output of the self-biased inverter circuit and configured to amplify the sensed noise signal to produce a saturated random signal.
2. The random signal generator circuit of claim 1, wherein the amplifier circuit comprises:
a first amplifier circuit coupled to the output of the self-biased inverter circuit and configured to amplify the sensed noise signal to produce an amplified noise signal; and
a second amplifier circuit AC coupled to the first amplifier circuit and configured to produce the saturated random signal responsive to the amplified noise signal.
3. The random signal generator circuit of claim 2, wherein the first amplifier circuit comprises an inverter circuit.
4. The random signal generator circuit of claim 3, wherein the first amplifier circuit comprises a plurality of cascaded inverter circuits.
5. The random signal generator circuit of claim 2, wherein the second amplifier circuit comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
6. The random signal generator circuit of claim 2, wherein the second amplifier circuit comprises a plurality of AC coupled amplifier circuits.
7. The random signal generator circuit of claim 6, wherein each of the plurality of AC coupled amplifier circuits comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
8. The random signal generator circuit of claim 2, wherein a gain of the first amplifier circuit is substantially greater than a gain of the self-biased inverter circuit, and wherein a gain of the second amplifier circuit is substantially greater than the gain of the first amplifier circuit.
9. The random signal generator circuit of claim 2:
wherein the self-biased inverter circuit comprises a self-biased CMOS inverter circuit:
wherein the first amplifier circuit comprises a CMOS inverter circuit or a plurality of cascaded CMOS inverter circuits; and
wherein the second amplifier circuit comprises a cascade combination of a self-biased CMOS inverter circuit and at least one CMOS inverter circuit.
10. The random signal generator circuit of claim 1, wherein the thermal noise generator circuit comprises a thermal noise generating resistor coupled to the input of the self-biased inverter circuit.
11. The random signal generator circuit of claim 10, wherein the thermal noise generator circuit comprises a series combination of a resistor and a capacitor coupled between the input of the self-biased inverter circuit and a signal ground node.
12. The random signal generator circuit of claim 1, further comprising a sampler coupled to the amplifier circuit and configured to produce a random digital signal from the saturated random signal responsive to a clock signal.
13. The random signal generator circuit of claim 12, wherein the sampler comprises a flip-flop.
14. A random number generator circuit including the random signal generator circuit of claim 1.
15. A random signal generator circuit comprising:
a thermal noise generator circuit;
a first single-ended amplifier circuit coupled to the thermal noise generator circuit and configured to sense and amplify a noise signal thereof to produce an amplified noise signal; and
a second single-ended amplifier circuit AC coupled to the first single-ended amplifier circuit and configured to produce a saturated random signal responsive to the amplified noise signal.
16. The random signal generator circuit of claim 15, wherein the first single-ended amplifier circuit comprises:
a self-biased inverter circuit having an input coupled to the thermal noise generator circuit and configured to produce a sensed noise signal at an output thereof responsive to thermal noise generated by the thermal noise generator circuit; and
at least one inverter circuit coupled to the output of the self-biased inverter circuit and configured to generate the amplified noise signal from the sensed noise signal.
17. The random signal generator circuit of claim 15, wherein the second single-ended amplifier circuit comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
18. The random signal generator circuit of claim 15, wherein the second single-ended amplifier circuit comprises a plurality of AC coupled amplifier circuits.
19. The random signal generator circuit of claim 18, wherein each of the plurality of AC coupled amplifier circuits comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
20. The random signal generator circuit of claim 15, wherein the thermal noise generator circuit comprises a resistor and wherein the first single-ended amplifier circuit is configured to generate the amplified noise signal responsive to a thermal noise voltage developed across the resistor.
21. The random signal generator circuit of claim 15, wherein the thermal noise generator circuit comprises a series combination of a resistor and a capacitor coupled between the input of the first single-ended amplifier circuit and a signal ground node.
22. The random signal generator circuit of claim 15, further comprising a sampler configured to generate a random digital signal from the saturated random signal.
23. A random number generator circuit including the random signal generator circuit of claim 1.
24. A method comprising:
coupling a thermal noise generator circuit to an input of a self-biased inverter circuit to generate a sensed noise signal at an output thereof,
applying the sensed noise signal to a first amplifier circuit to produce an unsaturated amplified noise signal; and
AC coupling the unsaturated noise signal to a second amplifier circuit to produce a saturated random signal.
25. The method of claim 24, wherein the first amplifier circuit comprises an inverter circuit.
26. The method of claim 25, wherein the first amplifier circuit comprises a plurality of cascaded inverter circuits.
27. The method of claim 24, wherein the second amplifier circuit comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
28. The method of claim 24, wherein the second amplifier circuit comprises a plurality of AC coupled amplifier circuits.
29. The method of claim 28, wherein each of the plurality of AC coupled amplifier circuits comprises a cascade combination of a self-biased inverter circuit and at least one inverter circuit.
30. The method of claim 24, wherein coupling a thermal noise generator circuit to an input of a self-biased inverter circuit to generate a sensed noise signal at an output thereof comprises generating the sensed noise signal responsive to a thermal noise voltage developed across a resistor of the thermal noise generator circuit.
31. The method of claim 30, wherein the thermal noise generator circuit comprises a series combination of a resistor and a capacitor coupled between the input of the self-biased inverter circuit and a signal ground node.
32. The method of claim 24, wherein a gain of the first amplifier circuit is substantially greater than a gain of the self-biased inverter circuit, and wherein a gain of the second amplifier circuit is substantially greater than the gain of the first amplifier circuit.
33. The method of claim 24:
wherein the self-biased inverter circuit comprises a self-biased CMOS inverter circuit:
wherein the first amplifier circuit comprises a CMOS inverter circuit or a plurality of cascaded CMOS inverter circuits; and
wherein the second amplifier circuit comprises a cascade combination of a self-biased CMOS inverter circuit and at least one CMOS inverter circuit.
34. The method of claim 24, further comprising generating a random digital signal from the saturated random signal.
35. The method of claim 34, wherein generating a random digital signal from the saturated random signal comprises sampling the saturated random signal responsive to a clock signal to produce the random digital signal.
36. The method of claim 35, wherein sampling the saturated random signal responsive to a clock signal to produce the random digital signal comprises sampling the saturated random signal using a flip-flop.
37. The method of claim 34, further comprising generating a random number from the random digital signal.