Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7369816 | Highly accurate temperature sensor employing mixed-signal components A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 05/06/2008 |
| 7245887 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 07/17/2007 |
| 7120399 | High speed CMOS transmit-receive antenna switch A high-speed CMOS transmit/receive antenna switch includes a first transistor, a second transistor and a parasitic compensation network. The first transistor is operably coupled to an antenna, to a transmit path, and to receive a transmit/receive (T/R) control signa... | 10/10/2006 |
| 7023267 | Switching power amplifier using a frequency translating delta sigma modulator A radio frequency (RF) switching power amplifier comprises: a switching amplifier 203 to provide an amplified signal within an RF band; and a delta signal modulator (DSM) 207 that is operable; to control the switching amplifier in a feedback configurat... | 04/04/2006 |
| 5815804 | Dual-band filter network A dual band filter network for a radio communication apparatus is provided. The network has an antenna (212) for receiving and transmitting signals from a first frequency band and a second frequency band. The network has a first duplex pair (202) includin... | 09/29/1998 |
| 4242642 | Pole quality factor (Q) enhancement technique for notch filters An enhanced pole quality factor (Q) notch filter section circuit includes an active biquadratic notch filter section and a pole quality factor enhancement amplifier responsive to the output of the biquadratic notch filter section for providing at the inpu... | 12/30/1980 |
