Month of November 2001 - Page Number 10

Showing 91 - 100 of 290 from November 2001
Browse Prior Art Database
  1. 91.
    This invention is a two way portable radio with selectable RF output power levels. Today's FM portable radios are designed for performance under worst case fringe area coverage conditions. The portable transmit- ter is designed for coverage at that worst case level and consequently transmits excessive RF output power...
    IPCOM000005979D | Original Publication Date: 1990-Oct-01
  2. 92.
    This invention is an RF power amplifier capable of energy efficient operation at several selectable output power levels. Radio Frequency amplifiers, especially those in portable transceivers, do nd maintain efficiency under reduced RF output conditions. Maintaining efficiency with RF output power cutback is a key...
    IPCOM000005978D | Original Publication Date: 1990-Oct-01
  3. 93.
    A polyimide and aluminum substrate is described that is preferably fabricated using standard integrated circuit photolithography liftoff methods rather than etching techniques. A prior substrate construction contains alternating layers of copper (conductor) and polyimide (dielectric) separated and attached using...
    IPCOM000005977D | Original Publication Date: 1990-Oct-01
  4. 94.
    Treating Q, and R, as a black box impedance Z,, the average impedance (Z,& as seen from Node 1 will be V,/IRIAVC1. Substituting IRIAVO with K(V,/R,) from above yields ZIAMj = RI/K. Since Ksl, then Z,A\~; rR1.
    IPCOM000005976D | Original Publication Date: 1990-Oct-01
  5. 95.
    To receive paging services in multiple coverage areas (ie; Miami I Atlanta) on systems with different frequencies I codes I coding protocol, the user must return the pager to the RCC for reprogramming. This new invention will provide a RCC to prepmgram the capabilities of the multiple area paging systems and allow the...
    IPCOM000005975D | Original Publication Date: 1990-Oct-01
  6. 96.
    Machine vision systems are a necessary part of many modern manufacturing processes such as electronic assembly involving fine pitch devices. One of the most difficult tasks in the development of a machine vision system is the design of an illumination system which can reliably generate images suitable for machine...
    IPCOM000005974D | Original Publication Date: 1990-Oct-01
  7. 97.
    MOS IC's frequently contain a crystal oscillator to provide clocking. Typically, a linear amplifier (comprised of a digital inverter biased by the feedback resistance of an "on" transmission-gate connected between the inverter input and output) and clock buffers are integrated on the IC, while the crystal and loading...
    IPCOM000005973D | Original Publication Date: 1990-Oct-01
  8. 98.
    A remote amplifier amplifies the RF output of a transmitting portable radio. A coaxial path between the portable radio and amplifier serves as the RF signal path as well as the control signal path. When the portable is in the receive- mode, the remote amplifier has a thmugh RF path for the antenna receive signals to...
    IPCOM000005972D | Original Publication Date: 1990-Oct-01
  9. 99.
    In a typical radio display application with backlighting, a flat lightpipe molded from clear plastic can be used to distribute light behind the LCD. This approach is likely to be used in conjunction with elastomeric connectors and a metal bezel, which clamps the LCD to a PCB.
    IPCOM000005971D | Original Publication Date: 1990-Oct-01
  10. 100.
    The exceptional combination of electrical, thermal, physical and chemical pmperties found in polyetherimide (PEI) resins make them particularly suited for printed circuit board (PCB) applications. PEI resins are noteworthy for their low dissipation factor at high frequencies, which makes the material ideal for use in...
    IPCOM000005970D | Original Publication Date: 1990-Oct-01