Claims
- 1. An integrated transceiver circuit packaged component comprising: a transceiver circuit having a bandstop filter, a common input/output port and an up converter/down converter, the bandstop filter being located between the common input/output port and the up converter/down converter and filtering both signals received and signals transmitted by the transceiver circuit to filter out unwanted sideband F .sub.LO -F.sub.IF wherein the transceiver circuit and the bandstop filter are integrated onto a single chip in order to increase isolation between the common port and the up converter/down converter.
- 2. The component according to claim 1, wherein the up converter/down converter comprises a mixer for mixing a locally generated frequency with the received signals when the transceiver circuit is being used in receive mode and with the transmitted signals when the transceiver circuit is being used in transmit mode.
- 3. The component according to claim 2, wherein the transceiver circuit includes between an intermediate frequency output thereof and the mixer a first differential amplifier, and between an intermediate frequency input thereof and the mixer a second differential amplifier, the transceiver circuit further including further switch means between the first and second differential amplifiers and the mixer by means of which the mixer is connected to at least one of the first and second differential amplifiers, the first and second differential amplifiers being operable to amplify the received and transmitted signals respectively.
- 4. The component according to claim 2, wherein the transceiver circuit includes a voltage controlled oscillator for providing to the mixer the locally generated frequency.
- 5. The component according to claim 4, wherein the transceiver circuit has a phase locked loop (PLL) drive output and includes connected thereto a PLL differential amplifier for providing a signal at the PLL drive output by amplifying a signal derived from the voltage controlled oscillator.
- 6. The component according to claim 2, wherein the transceiver circuit includes between the bandstop filter and the common input/output port a low noise amplifier for amplifying the received signals, a power amplifier for amplifying the transmitted signals, and switch means for connecting at least one of the low noise amplifier and the power amplifier between the filter and the common input/output port.
- 7. The component according to claim 6, wherein the transceiver circuit includes between an intermediate frequency output thereof and the mixer a first differential amplifier, and between an intermediate frequency input thereof and the mixer a second differential amplifier, the transceiver circuit further including further switch means between the first and second differential amplifiers and the mixer by means of which the mixer is connected to at least one of the first and second differential amplifiers, the first and second differential amplifiers being operable to amplify the received and transmitted signals respectively.
- 8. The component according to claim 6, wherein the bandstop filter rejects the unwanted sideband F.sub.LO -F.sub.IF to avoid saturation of the power amplifier on transmitting signals.
- 9. The component according to claim 8, wherein the bandstop filter rejects image noise on receiving signals.
- 10. The component according to claim 1, wherein the bandstop filter rejects image noise on receiving signals.
- 11. The component according to claim 1, which is packaged in plastic.
- 12. The component according to claim 1, wherein the transceiver operates in the region of the ISM band.
- 13. The component according to claim 1, in combination with a bandpass filter connected to the common input/output port for filtering both the received and transmitted signals.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9309206 |
May 1993 |
GBX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/223,588, filed on Apr. 6, 1994, which is now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0166347 |
Dec 1980 |
JPX |
5769939 |
Apr 1982 |
JPX |
3226022 |
Oct 1991 |
JPX |
2041701 |
Sep 1979 |
GBX |
WO-A-8500481 |
Jan 1985 |
WOX |
Non-Patent Literature Citations (2)
Entry |
Garry, Greg, "EBN Update : Fujistu , Level One Claim Success"; Electronic Buyers' News, p. 2, Dec. 1991. |
Proceedings of the Nineteenth International Symposium on Gallium Arsenide and Related Compounds, Karuizawa, Japan, Sep. 28-Oct. 2, 1992:"High performance, low cost GaAs MIMICS for personal phone applications at 1.9 GHz", Figure 1, pp. 911-916. |
Continuations (1)
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Number |
Date |
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Parent |
223588 |
Apr 1994 |
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