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[82.70.254.222]) by smtp.gmail.com with ESMTPSA id h76sm25595433wmd.2.2018.01.01.13.24.35 (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 01 Jan 2018 13:24:35 -0800 (PST) Date: Mon, 1 Jan 2018 21:24:33 +0000 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <781825051.20180101212433@gmail.com> To: rsgb_lf_group@blacksheep.org In-Reply-To: References: <1245872871.20180101103858@gmail.com> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Andy, MCP1404 IC fitted, as soon as power to the PA FETS is applied (even 6V) one of the gate square waves either disappears or becomes extremely random. Swapping inputs to the driver IC makes no difference, it's one pair of PA FET's dependent. FET's work fine when returned to "as designed" status! Driving the driver IC through the 1nF caps and 15k resistors to ground. Outputs from CLK0 and CLK1 are 180 out of phase and seem correct. Any ideas please? Thank you! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dead.fets[at]gmail.com) 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 33d261536bb1467bb13d5764461d5ec4 Subject: Re: LF: Si5351A syntehsiser able to fire a FET driver chip directly?? Content-Type: text/plain; charset=utf-8 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=PRIORITY_NO_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by klubnl.pl id w01LTgCQ024695 Hello Andy, MCP1404 IC fitted, as soon as power to the PA FETS is applied (even 6V) one of the gate square waves either disappears or becomes extremely random. Swapping inputs to the driver IC makes no difference, it's one pair of PA FET's dependent. FET's work fine when returned to "as designed" status! Driving the driver IC through the 1nF caps and 15k resistors to ground. Outputs from CLK0 and CLK1 are 180 out of phase and seem correct. Any ideas please? Thank you! http://www.gatesgarth.com/amp-modded.jpg Monday, January 1, 2018, 11:27:20 AM, you wrote: > Seems an odd choice of driver chip.  A high/low side driver used in > a non-bootstrapped mode to drive two low-side FETs  > How about one of the normal FET driver chips - picking out one I've > used in the past, the MCP14E 3/4/5 family.   Logic level input, > spec. Logic '0' max 1.3V, Logic '1' min 2.4V.   So bias half way and > your 2.2V swing takes it into the valid range. > They three types are inverting, non inverting, and one of each in a package > Andy  G4JNT -- Best regards, Chris mailto:dead.fets@gmail.com